bpo-33895: Relase GIL while calling functions that acquire Windows loader lock #7789
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Windows functions LoadLibrary, GetProcAddress, FreeLibrary and GetModuleHandle use the system loader lock. Calling these while holding the GIL will cause a dead lock in the rare occasion that another thread
is detaching and needs to destroy its thread state at the same time.
https://bugs.python.org/issue33895