[issue43307] Sync site.py and sysconfig.py with PyPy

[mattip]

Change by mattip <matti.picus at gmail.com>:


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keywords: +patch
pull_requests: +23413
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24628

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43307>
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