Reverted parts of r16963 to fix a regression on the creation of permissions on...

Reverted parts of r16963 to fix a regression on the creation of permissions on proxy models. Refs #17904. Thanks koenb for the report and claudep for the patch.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@17776 bcc190cf-cafb-0310-a4f2-bffc1f526a37