Disable a hack that causes breakage on Python 3.8 (#33137)
Hacking sys.modules here was added unconditionally to fix an import problem on
Windows (with Python 2.7???).
This script works fine on Python 2.7 on macOS either with or without this hack.
This script breaks badly on Python 3.8 on macOS with this hack, so I've disabled
it here for all Python 3.
