[issue30764] regrtest: Add --fail-env-changed option

[STINNER Victor]

STINNER Victor added the comment:


New changeset fea98bfcff6ccf9142daa97677fe86c1fdf8e63e by Victor Stinner in branch '2.7':
[2.7] bpo-30523, bpo-30764, bpo-30776: Sync regrtest from master (#2444)
https://github.com/python/cpython/commit/fea98bfcff6ccf9142daa97677fe86c1fdf8e63e


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<http://bugs.python.org/issue30764>
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