[3.11] gh-98178: syslog() is not thread-safe on macOS (GH-98213)#98237
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On macOS, fix a crash in syslog.syslog() in multi-threaded
applications. On macOS, the libc syslog() function is not
thread-safe, so syslog.syslog() no longer releases the GIL to call
it.
(cherry picked from commit d4b9166)
Co-authored-by: Victor Stinner vstinner@python.org