[issue18713] Enable surrogateescape on stdin and stdout when appropriate

[STINNER Victor]

STINNER Victor added the comment:

> Is it a bug in your patch, or is it deliberate?

It was not deliberate, and I think that it would be more consistent to
use the same error handler (surrogateescape) when only the encoding is
changed by the PYTHONIOENCODING environment variable. So
surrogateescape should be used even with PYTHONIOENCODING=utf-8.

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<http://bugs.python.org/issue18713>
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