Merge with pypa/distutils@152c13d #3430
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On Windows there is nothing like rpath, so when CygwinCCompiler() tries to link it will assume unix and pass rpath flags to the linker, which will fail. In cygwin this is currently patched away: https://cygwin.com/git-cygwin-packages/?p=git/cygwin-packages/python39.git;a=blob;f=3.1-enable-new-dtags.patch;h=716af3b14d3483e5a4 It is taking some macos fallback branch that is equal to library_dirs, which doesn't add much if library_dirs is set, so in theory it should just return [] there. This patch tries to bring it a bit closer to MSVCCompiler() which warns if runtime_library_dirs is passed and raises if runtime_library_dir_option() is called. In the case of cygwin we only warn if runtime_library_dir_option() is called and return nothing, so runtime_library_dirs is ignored. It's debatable if it should fail here, but since cygwin is used to build unix software that might not be aware of this limitation a warning seems more fitting. In the mingw case we assume the user knows that they are targeting Windows and so we can be more strict and error out like MSVCCompiler(). In both cases we warn if runtime_library_dirs is passed to the compiler, like with MSVC.
Remove warning about packages not containing `__init__.py` files
Improve handling if runtime_library_dirs is set with cygwin/mingw
…s.cfg as found in the stdlib. Fixes pypa/distutils#152.
Add support for Homebrew on Python 3.9
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