[issue41617] __builtin_bswap16 is used without checking it is supported

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:


New changeset ec306a2fd91d8b961b2a80c080dd2262bb17d862 by Victor Stinner in branch '3.9':
bpo-41617: Add _Py__has_builtin() macro (GH-23260) (GH-23262)
https://github.com/python/cpython/commit/ec306a2fd91d8b961b2a80c080dd2262bb17d862


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<https://bugs.python.org/issue41617>
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