[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset b50e7683acac36ff16e6c6c2c32d9a15e46b5174 by Victor Stinner in branch '3.6':
bpo-31234: test_threading: fix ref cycle (#3150) (#3152)
https://github.com/python/cpython/commit/b50e7683acac36ff16e6c6c2c32d9a15e46b5174


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