Add support for PyPy

In test_unixcompiler.test_osx*, also patch sysconfig.get_config_vars following the patterns of prior implementations.

Acknowledge and ignore warning about TestDistribution (it's a "test" distribution, not a "test of distributions").

Mark test_venv to be skipped when running under a virtualenv as virtualenv monkey patches distutils.

- Fix upload test on systems that blocks MD5
- Add SHA2-256 and Blake2b-256 digests based on new Warehous and twine
  specs.
Signed-off-by: Christian Heimes <christian@python.org>

distutils.tests now saves/restores warnings filters to leave them
unchanged. Importing tests imports docutils which imports
pkg_resources which adds a warnings filter.

It is possible to use either '-isysroot /some/path' (with a space) or
'-isysroot/some/path' (no space in between). Support both forms in
places where special handling of -isysroot is done, rather than just
the first form.
Co-authored-by: Ned Deily <nad@python.org>

Add --with-platlibdir option to the configure script: name of the
platform-specific library directory, stored in the new sys.platlitdir
attribute. It is used to build the path of platform-specific dynamic
libraries and the path of the standard library.

It is equal to "lib" on most platforms. On Fedora and SuSE, it is
equal to "lib64" on 64-bit systems.
Co-Authored-By: Jan Matějek <jmatejek@suse.com>
Co-Authored-By: Matěj Cepl <mcepl@cepl.eu>
Co-Authored-By: Charalampos Stratakis <cstratak@redhat.com>

Reimplement distutils.spawn.spawn() function with the subprocess
module.

setup.py now uses a basic implementation of the subprocess module if
the subprocess module is not available: before required C extension
modules are built.

bpo-39432: Implement PEP-489 algorithm for non-ascii "PyInit_*" symbol names in distutils (GH-18150)



Make it export the correct init symbol also on Windows.



https://bugs.python.org/issue39432

When checking `setup.py` and when the `author` field was provided, but
the `author_email` field was missing, erroneously a warning message was
displayed that the `author_email` field is required.

The specs do not require the `author_email`field:
https://packaging.python.org/specifications/core-metadata/#author

The same is valid for `maintainer` and `maintainer_email`.

The warning message has been adjusted.

modified:   Doc/distutils/examples.rst
modified:   Lib/distutils/command/check.py


https://bugs.python.org/issue38914

Provides a richer platform tag for AIX that we expect to be sufficient for PEP 425
binary distribution identification. Any backports to earlier Python versions will be
handled via setuptools.

Patch by Michael Felt.

https://bugs.python.org/issue37965


https://bugs.python.org/issue37965



Automerge-Triggered-By: @benjaminp

They now return NotImplemented for unsupported type of the other operand.

When building packages (e.g. for openSUSE Linux)
(random) filesystem order of input files
influences ordering of functions in the output .so files.
Thus without the patch, builds (in disposable VMs) would usually differ.

Without this patch, all callers have to be patched individually
https://github.com/dugsong/libdnet/pull/42
https://github.com/sass/libsass-python/pull/212
https://github.com/tahoe-lafs/pycryptopp/pull/41
https://github.com/yt-project/yt/pull/2206
https://github.com/pyproj4/pyproj/pull/142
https://github.com/pytries/datrie/pull/49
https://github.com/Roche/pyreadstat/pull/37
but that is an infinite effort.

See https://reproducible-builds.org/ for why this matters.

The distutils bdist_wininst command is now deprecated, use
bdist_wheel (wheel packages) instead.