testsuite: fix executability test skip on FreeBSD (EFTYPE)

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FreeBSD and OpenBSD return EFTYPE (errno 79) when chmod-ing a sticky bit
onto a regular file as non-root, rather than EPERM/EACCES. Catch OSError
and check errno against the expected skip set so the test skips correctly
on those platforms instead of erroring out.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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