[issue16166] Add PY_BYTE_ORDER macro to get endianess of platform

[Antoine Pitrou]

Antoine Pitrou added the comment:

This doesn't depend on #16113 (quite the contrary).

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dependencies:  -Add SHA-3 (Keccak) support

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