(#8662) Don't manage internal file permissions on Windows

When running as root, puppet will by default manage internal file
permissions for file-related settings. However, ruby does not support
chown/chgrp functionality on Windows, so puppet will fail to run
(puppet apply generates an exception while trying to set the owner,
etc).

This commit disables internal file permissions handling on Windows
until we add support for chown (at least) as part of the larger file
type effort on Windows.