[issue8640] subprocess: canonicalize env to bytes on Unix (Python3)

[STINNER Victor]

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

os.exeve() and os.exevpe() should also canonicalize env to bytes.

os.exeve() and os.exevpe(), but not os._exevpe() to avoid doing it twice (once in subprocess, once in os._exevpe). Patch os._exevpe() is not enough because subprocess doesn't call it on Unix if _subprocessposix module is present.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8640>
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