Removed windows compilation warning: 'WIN32_LEAN_AND_MEAN' redefined

[gpalino]

Removed this warning:
src/unwind/unwind.hpp:10:10: warning: 'WIN32_LEAN_AND_MEAN' redefined
Similar background like in #186

[gpalino]

I tried to fix also this warning under MSYS2+MINGW64 platform, gcc version 15.1.0:

/d/bin/msys64/mingw64/bin/g++.exe -DASIO_STANDALONE -DCPPTRACE_DEMANGLE_WITH_CXXABI -DCPPTRACE_GET_SYMBOLS_WITH_DBGHELP -DCPPTRACE_GET_SYMBOLS_WITH_LIBDWARF -DCPPTRACE_HAS_CXX_EXCEPTION_TYPE -DCPPTRACE_STATIC_DEFINE -DCPPTRACE_UNWIND_WITH_DBGHELP -DGLBINDING_STATIC_DEFINE -DHAS_ATTRIBUTE_PACKED -DLIBDWARF_STATIC -DMINGW_HAS_SECURE_API -DNGHTTP2_STATICLIB -DNOMINMAX -DPIC -DWIN32_LEAN_AND_MEAN -D_WIN32_WINNT=0x0601 -D__STDC_FORMAT_MACROS -D__USE_MINGW_ANSI_STDIO -ID:/code/widelands/build/_deps/cpptrace-src/src -ID:/code/widelands/build/_deps/libdwarf-src/src/lib/libdwarf -isystem D:/code/widelands/build/_deps/cpptrace-src/include -isystem D:/code/widelands/build/_deps/cpptrace-build/include -O2 -g -DNDEBUG -fvisibility=hidden -fno-keep-inline-dllexport -Wall -Wextra -Werror=return-type -Wundef -Wuseless-cast -Wmaybe-uninitialized -MD -MT _deps/cpptrace-build/CMakeFiles/cpptrace-lib.dir/src/unwind/unwind_with_dbghelp.cpp.obj -MF _deps\cpptrace-build\CMakeFiles\cpptrace-lib.dir\src\unwind\unwind_with_dbghelp.cpp.obj.d -o _deps/cpptrace-build/CMakeFiles/cpptrace-lib.dir/src/unwind/unwind_with_dbghelp.cpp.obj -c D:/code/widelands/build/_deps/cpptrace-src/src/unwind/unwind_with_dbghelp.cpp
D:/code/widelands/build/_deps/cpptrace-src/src/unwind/unwind_with_dbghelp.cpp: In function 'std::vector<long long unsigned int> cpptrace::v1::detail::capture_frames(std::size_t, std::size_t, EXCEPTION_POINTERS*)':
D:/code/widelands/build/_deps/cpptrace-src/src/unwind/unwind_with_dbghelp.cpp:28:21: warning: argument 'skip' might be clobbered by 'longjmp' or 'vfork' [-Wclobbered]
   28 |         std::size_t skip,
      |         ~~~~~~~~~~~~^~~~

With this patch: warn2.patch
But when g++ gets parameter -std=gnu++20, there starts warning: 'volatile'-qualified parameter is deprecated [-Wvolatile]
So giving up solving this second warning.

[jeremy-rifkin]

Thanks!

[jeremy-rifkin]

Regarding the second error, I don't see how that parameter could be clobbered. Using volatile to try to suppress the warning wouldn't be a good solution, though. A #pragma GCC diagnostic ignored might be appropriate here.