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

[STINNER Victor]

STINNER Victor added the comment:


New changeset 2097b9e0ef32ab7a0d745edc0f707c615780c006 by Victor Stinner in branch '2.7':
[2.7] bpo-30764: test_subprocess uses SuppressCrashReport (#2405) (#2412)
https://github.com/python/cpython/commit/2097b9e0ef32ab7a0d745edc0f707c615780c006


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