bpo-44117: Remove PyEval_InitThreads() #26070
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Remove PyEval_InitThreads() and PyEval_ThreadsInitialized()
functions. The GIL is created by Py_Initialize() since Python 3.7,
and so calling explicitly PyEval_InitThreads() was useless since
Python 3.7. Deprecated in 3.9, PyEval_InitThreads() did nothing and
PyEval_ThreadsInitialized() already returned true.
https://bugs.python.org/issue44117