[issue33015] Fix function cast warning in thread_pthread.h

[Alexey Izbyshev]

Alexey Izbyshev <izbyshev at ispras.ru> added the comment:

Such casts will also trigger a CFI violation if somebody tries to build Python (and the libc, in this case) with a signature-based CFI [1, 2]. It checks that the compile-time callee signature matches the signature of the actually called function in runtime. 

[1] https://clang.llvm.org/docs/ControlFlowIntegrity.html
[2] https://android-developers.googleblog.com/2018/10/control-flow-integrity-in-android-kernel.html

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nosy: +izbyshev

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