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Fix use of unset errno after pthread_sigmask calls
(a cherry-pick of commit e55d1b99b from 'release-8_2')

* pthread_support.c [PARALLEL_MARK]
(GC_start_mark_threads_inner): Do not pass errno value to WARN() calls
(because pthread_create and pthread_sigmask do not set errno).
* win32_threads.c [PARALLEL_MARK && GC_PTHREADS_PARAMARK
&& !NO_MARKER_SPECIAL_SIGMASK] (GC_start_mark_threads_inner): Likewise.

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