[issue8533] regrtest: use backslashreplace error handler for stdout

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> Let's try: r80703

This one looks ok: the output order is kept and I didn't noticed anything special in the buildbot output.

Backported to 3.1 as r80711. Close the issue.

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resolution:  -> fixed
status: open -> closed

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