[issue23968] rename the platform directory from plat-$(MACHDEP) to plat-$(PLATFORM_TRIPLET)

[Matěj Stuchlík]

Changes by Matěj Stuchlík <matej.stuchlik at gmail.com>:


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nosy: +sYnfo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23968>
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