[issue41617] __builtin_bswap16 is used without checking it is supported

[STINNER Victor]

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

> Older clang versions don't have __builtin_bswap16,

According to https://github.com/nodejs/node/pull/7644 it's available in clang 3.2 but not in clang 3.0.

I wrote PR 21949 to fix the issue: it only uses __has_builtin() if __clang__ is defined, it's different than PR 21942.

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