c11: It's should detect PTHREAD_DESTRUCTOR_ITERATIONS when define TSS_DTOR_ITERATIONS

INIT_ONCE_STATIC_INIT looks like miscopied from Win32's init once macro
Correct implementation for reference
https://gitlab.inria.fr/gustedt/p99/-/blob/master/p99/p99_threads_posix.h#L64

C11 standard:
https://en.cppreference.com/w/c/thread/TSS_DTOR_ITERATIONS

As TSS_DTOR_ITERATIONS didn't used in mesa codebase, so it's won't affect anything in mesa

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
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merge request