[issue4035] Support bytes for os.exec*()

[STINNER Victor]

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

The patch is incomplete. It allows bytes for the arguments but not for 
the environment variables: posix_execve() in Modules/posixmodule.c 
uses:
 PyArg_Parse(key "s", &k)
 PyArg_Parse(val "s", &v)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4035>
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