Fix issue with distutils warning

Prefer included distutils even without importing setuptools. Closes #2259.

Add tests capturing expected distutils behavior.

Bypass pytest-virtualenv due to bugs in 'run' command. Instead, use jaraco.envs.VirtualEnv and build a bespoke fixture with a run command.

Set up GHA to test on Python 3.9-beta and 3.8-dev

Fixed typo

Bugfix/tests for msvc spawn

In _msvccompiler.MSVCCompiler.spawn, use correct capitalization for PATH environment variable. Fixes failing test and fixes pypa/setuptools#2257.

In CCompiler, allow keyword arguments to be passed to spawn calls. Ref pypa/setuptools#2257 and pypa/distutils#5.

In TestSpawn.test_concurrent_safe, use CheckThread to ensure that the spawn call does not simply fail to execute. Ref pypa/setuptools#2257.

Suppress ImportError for winreg as the module is only available on some platforms. Allows unit testing of module on non-Windows platforms.

The PyPA has adopted the PSF code of conduct

For details, see:

* https://discuss.python.org/t/implementing-pep-609-pypa-governance/4745

Replace install behavior on import with direct invocation (now that 'enabled' logic is duplicated in pth file).

Update docstring to use imperative voice, provide a bit more context, and advise against copying of the behavior.

Add docs on porting from distutils.

Remove logo