[issue34032] Add platlibdir to allow distinction between /usr/lib and /usr/lib64 for Linux

[Matej Cepl]

Change by Matej Cepl <mcepl at cepl.eu>:


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pull_requests: +7678
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34032>
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