[3.6] bpo-20891: Fix PyGILState_Ensure() (#4650) #4655
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When PyGILState_Ensure() is called in a non-Python thread before PyEval_InitThreads(), only call PyEval_InitThreads() after calling PyThreadState_New() to fix a crash. Add an unit test in test_embed. Enhance also embedded tests, backport from master: * Add test_pre_initialization_api() * Set PYTHONIOENCODING environment variable in test_forced_io_encoding() (cherry picked from commit b4d1e1f)
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When PyGILState_Ensure() is called in a non-Python thread before
PyEval_InitThreads(), only call PyEval_InitThreads() after calling
PyThreadState_New() to fix a crash.
Add an unit test in test_embed.
Enhance also embedded tests, backport from master:
test_forced_io_encoding()
(cherry picked from commit b4d1e1f)
https://bugs.python.org/issue20891