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

[Ned Deily]

Ned Deily added the comment:

It's not just broken for cross-compiling.  As I noted earlier, it's broken when using other than gcc, such as is the case with current OS X systems.  This needs to be fixed before release.

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