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Backport !3398 “Avoid having g_futex_simple() inadvertently modify errno” to glib-2-76

Philip Withnall requested to merge pwithnall/glib:backport-3398-futex-errno-glib-2-76 into glib-2-76

If both __NR_futex and __NR_futex_time64 are defined, g_futex_simple() will first call futex_time64(). If that fails with ENOSYS, then futex_time() is called instead. However, errno was not saved and restored in this case, which would result in g_futex_simple() returning with errno set to ENOSYS, even if futex_time() succeeded.

Trivial backport of !3398 (merged) to glib-2-76.

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