[issue33015] Fix function cast warning in thread_pthread.h

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Shall we introduce a new thread-starting API that takes a function with the "correct" pthread signature?

Do we need it? I don't think saving a single memory allocation is worth the bother.

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