[issue37531] Fix regrtest timeout for subprocesses: regrtest -jN --timeout=SECONDS

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


----------
pull_requests: +15870
pull_request: https://github.com/python/cpython/pull/16285

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37531>
_______________________________________