distutils deprecated

[osvenskan]

Per PEP 632, distutils will raise a deprecation warning as of Python 3.10 and will be totally gone as of Python 3.12. posix_ipc's setup.py uses distutils so that needs to be fixed.

https://www.python.org/dev/peps/pep-0632/

[osvenskan]

For the upcoming version of posix_ipc (1.1.0), the reference to distutils is still in the code. It's only imported when setuptools is not present. I think setuptools is part of most Python distros now, so the import of distutils is unlikely to happen. (I guess I'll find out if I start to get feedback about deprecation warnings.) At this time, continuing to use distutils as a fallback when setuptools isn't available feels like the most robust solution. Here's where I changed the relevant comment in the source code.

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