[issue27829] test.regrtest: changed environment variables are not logged

[Roundup Robot]

Roundup Robot added the comment:

New changeset 491bbba73bca by Victor Stinner in branch 'default':
Show regrtest env changed warn on Windows buildbot
https://hg.python.org/cpython/rev/491bbba73bca

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<http://bugs.python.org/issue27829>
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