[issue40302] Add _Py_bswap32() function to pyport.h

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

There are multiple files which have to swap bytes. I propose to add functions for that:

* _Py_bswap16(): uint16_t
* _Py_bswap32(): uint32_t
* _Py_bswap64(): uint64_t

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components: Interpreter Core
messages: 366600
nosy: vstinner
priority: normal
severity: normal
status: open
title: Add _Py_bswap32() function to pyport.h
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40302>
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