[issue45743] Cleanup and simplify setup.py

[Christian Heimes]

Change by Christian Heimes <lists at cheimes.de>:


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keywords: +patch, patch
pull_requests: +27710, 27711
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/29456

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45743>
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