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

[STINNER Victor]

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

The fix can be changed to be specific to POSIX system:
+    if name == 'posix' \
+    and isinstance(file, bytes):
+        encoding = sys.getfilesystemencoding()
+        PATH = (bytes(dir, encoding) for dir in PATH)

My example was incorrect. The good example is:
   python -c "import os; os.execvp('pwd', ['pwd'])

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