[GR-19513] The LLVM 9-based toolchain no longer depends on libxml2

Author: eregon

README.md

@@ -106,7 +106,7 @@ environment, for example by unmounting system filesystems such as `/dev/shm`.
 
 ## Dependencies
 
-* [make, gcc and libxml2](doc/user/installing-llvm.md) for building C and C++ extensions.
+* [make and gcc](doc/user/installing-llvm.md) for building C and C++ extensions.
 * [libssl](doc/user/installing-libssl.md) for the `openssl` C extension
 * [zlib](doc/user/installing-zlib.md) for the `zlib` C extension
 

doc/user/installing-llvm.md

@@ -9,13 +9,13 @@ The `make` utility as well as the dependencies of the toolchain still need to be
 ## RedHat-based: Fedora, Oracle Linux, etc
 
 ```bash
-$ sudo dnf install make gcc libxml2
+$ sudo dnf install make gcc
 ```
 
 ## Debian-based: Ubuntu, etc
 
 ```bash
-$ sudo apt-get install make gcc libxml2
+$ sudo apt-get install make gcc
 ```
 
 ## macOS

tool/docker-configs.yaml

@@ -17,7 +17,7 @@ deb_packages: &deb_packages
   specs: netbase
   zlib: libz-dev
   openssl: libssl-dev
-  cext: gcc libxml2 make
+  cext: gcc make
   source: file g++ python ruby
 
 ol7: