[issue8513] subprocess: support bytes program name

[STINNER Victor]

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

My patch changes:
 * os._execvpe(): support bytes type for the file argument (program name)
 * os.get_exec_path(): support bytes type for the PATH environment variable
 * Popen._execute_child(): decode the executable name before encoding the arguments (if the program name is not an absolute path)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8513>
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