[issue16166] Add PY_BYTE_ORDER macro to get endianess of platform

[Ned Deily]

Ned Deily added the comment:

Christian: That's right because there is only one configure execution in the OS X universal builds and only compiler call per module just like a normal single-architecture unix build.  Under the covers, the Apple compiler driver transparently makes multiple compiler calls, one for each architecture, and then use lipo to combine the binaries into one .o file etc.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16166>
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