[issue8533] regrtest: use backslashreplace error handler for stdout

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 8be9eaf5829f by Victor Stinner in branch 'default':
Issue #8533: regrtest replaces also sys.stdout on Windows
http://hg.python.org/cpython/rev/8be9eaf5829f

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nosy: +python-dev

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