[issue40854] [Patch] Allow overriding sys.platlibdir

[Sandro Mani]

New submission from Sandro Mani <manisandro at gmail.com>:

You can currently point the python interpreter to a different install say via

    export PYTHONHOME=<Prefix>
    export PYTHONPATH=<Prefix>/lib/python3.9
    python3

With the newly added platlibdir [1], if python was configured with platlibdir=lib64, this will break because i.e. the site-packages dir as returned by `sysconfig.get_paths()` will use lib64 and not lib as the other install may be using.

This PR adds the possibility to override the platlibdir via environment variable.

Full rationale: [2].

[1] https://github.com/python/cpython/pull/8068
[2] https://src.fedoraproject.org/rpms/python3.9/pull-request/10

----------
components: Interpreter Core
messages: 370655
nosy: smani
priority: normal
severity: normal
status: open
title: [Patch] Allow overriding sys.platlibdir
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40854>
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