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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

You marked 3.7 here, which only gets security patches, but submitted a PR for master, which is appropriate for enhancements.  ('backport' here on the tracker means apply to older version after patching master.)

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nosy: +terry.reedy
type:  -> enhancement
versions: +Python 3.10 -Python 3.7

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<https://bugs.python.org/issue43307>
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