[issue20035] Suppress 'os.environ was modified' warning on Tcl/Tk tests

[Roundup Robot]

Roundup Robot added the comment:

New changeset c12cc78d59c1 by Zachary Ware in branch 'default':
Issue #15968: Temporarily revert change to PCbuild/rt.bat
http://hg.python.org/cpython/rev/c12cc78d59c1

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nosy: +python-dev

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