[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset 42f7e0d8b0ca940a809a786f25d967dcce4d71b6 by Victor Stinner in branch '2.7':
bpo-31234: fork_wait tests now join threads (#3139) (#3535)
https://github.com/python/cpython/commit/42f7e0d8b0ca940a809a786f25d967dcce4d71b6


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