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On Unix, if the sem_clockwait() function is available in the C
library (glibc 2.30 and newer), the threading.Lock.acquire() method
now uses the monotonic clock (time.CLOCK_MONOTONIC) for the timeout,
rather than using the system clock (time.CLOCK_REALTIME), to not be
affected by system clock changes.
configure now checks if the sem_clockwait() function is available.
(cherry picked from commit 6df8c32753)
Co-authored-by: Victor Stinner <vstinner@python.org>
Miscellaneous source files for the main Python shared library