[issue18049] Re-enable threading test on macOS

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I'm not sure if it's related, but test_threading.test_recursion_limit() started to crash on two AIX buildbot workers after commit 1a057bab0f18d6ad843ce321d1d77a4819497ae4:
https://bugs.python.org/issue36273#msg348845

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nosy: +vstinner

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