Python 3.7 backport for sharedmemory does not compile on Mac OS

## Setup
OS: 10.15.17 (Catalina), running bash, in spite of Catalina's best efforts to convince me otherwise

```
> gcc -v
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 11.0.0 (clang-1100.0.33.17)
Target: x86_64-apple-darwin19.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
```

```
> python --version
Python 3.7.9
```

```
> pip3 --version
pip 22.0.4 from /Users/ash/Library/Python/3.7/lib/python/site-packages/pip (python 3.7)
```

```
> xcode-select -v
xcode-select version 2373.
```

## Error
```
> pip3 install getm 
Collecting getm
  Using cached getm-0.0.4.tar.gz (24 kB)
  Preparing metadata (setup.py) ... done
Requirement already satisfied: requests in /Users/ash/Library/Python/3.7/lib/python/site-packages (from getm) (2.25.1)
Requirement already satisfied: jsonschema in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from getm) (4.4.0)
Requirement already satisfied: google-crc32c in /Users/ash/Library/Python/3.7/lib/python/site-packages (from getm) (1.0.0)
Requirement already satisfied: cffi>=1.0.0 in /Users/ash/Library/Python/3.7/lib/python/site-packages (from google-crc32c->getm) (1.14.2)
Requirement already satisfied: attrs>=17.4.0 in /Users/ash/Library/Python/3.7/lib/python/site-packages (from jsonschema->getm) (20.3.0)
Requirement already satisfied: importlib-resources>=1.4.0 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from jsonschema->getm) (5.4.0)
Requirement already satisfied: typing-extensions in /Users/ash/Library/Python/3.7/lib/python/site-packages (from jsonschema->getm) (4.1.1)
Requirement already satisfied: pyrsistent!=0.17.0,!=0.17.1,!=0.17.2,>=0.14.0 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from jsonschema->getm) (0.18.1)
Requirement already satisfied: importlib-metadata in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from jsonschema->getm) (4.0.1)
Requirement already satisfied: urllib3<1.27,>=1.21.1 in /Users/ash/Library/Python/3.7/lib/python/site-packages (from requests->getm) (1.26.8)
Requirement already satisfied: idna<3,>=2.5 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests->getm) (2.10)
Requirement already satisfied: chardet<5,>=3.0.2 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests->getm) (3.0.4)
Requirement already satisfied: certifi>=2017.4.17 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests->getm) (2020.6.20)
Requirement already satisfied: pycparser in /Users/ash/Library/Python/3.7/lib/python/site-packages (from cffi>=1.0.0->google-crc32c->getm) (2.20)
Requirement already satisfied: zipp>=3.1.0 in /Users/ash/Library/Python/3.7/lib/python/site-packages (from importlib-resources>=1.4.0->jsonschema->getm) (3.1.0)
Building wheels for collected packages: getm
  Building wheel for getm (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py bdist_wheel did not run successfully.
  │ exit code: 1
  ╰─> [32 lines of output]
      running bdist_wheel
      running build
      running build_py
      creating build
      creating build/lib.macosx-10.9-x86_64-3.7
      creating build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/checksum.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/version.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/reader.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/cli.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/utils.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/http.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/progress.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      creating build/lib.macosx-10.9-x86_64-3.7/getm/concurrent
      copying getm/concurrent/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent
      copying getm/concurrent/collections.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent
      copying getm/concurrent/buffers.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent
      creating build/lib.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37
      copying getm/concurrent/shared_memory_37/shared_memory.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37
      copying getm/concurrent/shared_memory_37/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37
      running build_ext
      building 'getm.concurrent.shared_memory_37._posixshmem' extension
      creating build/temp.macosx-10.9-x86_64-3.7
      creating build/temp.macosx-10.9-x86_64-3.7/getm
      creating build/temp.macosx-10.9-x86_64-3.7/getm/concurrent
      creating build/temp.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37
      gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -I/Library/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c getm/concurrent/shared_memory_37/posixshmem.c -o build/temp.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37/posixshmem.o
      gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37/posixshmem.o -lrt -o build/lib.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37/_posixshmem.cpython-37m-darwin.so
      ld: library not found for -lrt
      clang: error: linker command failed with exit code 1 (use -v to see invocation)
      error: command '/usr/bin/gcc' failed with exit code 1
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for getm
  Running setup.py clean for getm
Failed to build getm
Installing collected packages: getm
  Running setup.py install for getm ... error
  error: subprocess-exited-with-error

  × Running setup.py install for getm did not run successfully.
  │ exit code: 1
  ╰─> [34 lines of output]
      running install
      /Users/ash/Library/Python/3.7/lib/python/site-packages/setuptools/command/install.py:37: SetuptoolsDeprecationWarning: setup.py install is deprecated. Use build and pip and other standards-based tools.
        setuptools.SetuptoolsDeprecationWarning,
      running build
      running build_py
      creating build
      creating build/lib.macosx-10.9-x86_64-3.7
      creating build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/checksum.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/version.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/reader.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/cli.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/utils.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/http.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      copying getm/progress.py -> build/lib.macosx-10.9-x86_64-3.7/getm
      creating build/lib.macosx-10.9-x86_64-3.7/getm/concurrent
      copying getm/concurrent/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent
      copying getm/concurrent/collections.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent
      copying getm/concurrent/buffers.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent
      creating build/lib.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37
      copying getm/concurrent/shared_memory_37/shared_memory.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37
      copying getm/concurrent/shared_memory_37/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37
      running build_ext
      building 'getm.concurrent.shared_memory_37._posixshmem' extension
      creating build/temp.macosx-10.9-x86_64-3.7
      creating build/temp.macosx-10.9-x86_64-3.7/getm
      creating build/temp.macosx-10.9-x86_64-3.7/getm/concurrent
      creating build/temp.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37
      gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -I/Library/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c getm/concurrent/shared_memory_37/posixshmem.c -o build/temp.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37/posixshmem.o
      gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37/posixshmem.o -lrt -o build/lib.macosx-10.9-x86_64-3.7/getm/concurrent/shared_memory_37/_posixshmem.cpython-37m-darwin.so
      ld: library not found for -lrt
      clang: error: linker command failed with exit code 1 (use -v to see invocation)
      error: command '/usr/bin/gcc' failed with exit code 1
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: legacy-install-failure

× Encountered error while trying to install package.
╰─> getm

note: This is an issue with the package mentioned above, not pip.
hint: See above for output from the failure.
```

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Python 3.7 backport for sharedmemory does not compile on Mac OS #132

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Python 3.7 backport for sharedmemory does not compile on Mac OS #132

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