[issue33015] Fix function cast warning in thread_pthread.h

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:


New changeset 8f83c2fb19c45350c2161d9e75dab4cd2bcaee28 by Victor Stinner in branch '2.7':
bpo-33015: Fix UB in pthread PyThread_start_new_thread (GH-6008) (GH-10823)
https://github.com/python/cpython/commit/8f83c2fb19c45350c2161d9e75dab4cd2bcaee28


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<https://bugs.python.org/issue33015>
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