[issue37788] fix for bpo-36402 (threading._shutdown() race condition) causes reference leak

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Copy of wmanley's comment:
https://github.com/python/cpython/pull/13948#issuecomment-541076882
"""
This caused a regression for people overriding Thread.join to implement custom thread interruption. See https://stackoverflow.com/questions/50486083/ending-non-daemon-threads-when-shutting-down-an-interactive-python-session
"""

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