WIP: Add C11 thread support library

Ondřej Surý requested to merge ondrej/c11-threads into main

This is just for funsies for the moment, but it could be actually useful when finished as we can then use: https://cgit.freedesktop.org/mesa/mesa/tree/include/c11 to pull c11 compatibily layer and drop our win32 threads implementation.

Edited by Ondřej Surý

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