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

This reverts commit 0f491dc2.

This reverts commit 402880a7, reversing
changes made to bd110264.

This reverts commit fd94cd03.

This reverts commit 40564354.