[issue1294959] Add sys.platlibdir to use /usr/lib64 on Fedora and SuSE

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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versions:  -Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue1294959>
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