[issue7516] Flag "-3" is silently ignored when running "regrtest.py -j2"

[flox]

flox <laxyf at yahoo.fr> added the comment:

This issue (and the patch) is to warn the tester that the flags and
environment variables are ignored.

Sorry for the DeprecationWarning noise, it is some silly test on my sandbox.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7516>
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