[issue40947] Replace PLATLIBDIR macro with config->platlibdir

[Sandro Mani]

Change by Sandro Mani <manisandro at gmail.com>:


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keywords: +patch
pull_requests: +19994
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/20799

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40947>
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