[issue16166] Add PY_BYTE_ORDER macro to get endianess of platform

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Fine with me. Having three macros is pointless complication.

Don't having two macros for one boolean value pointless complication too?

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