[1.1.X] Fixed #11936 -- Removed deferred models from the list returned by the...

[1.1.X] Fixed #11936 -- Removed deferred models from the list returned by the app_cache. Thanks to ryszard for the report, and clamothe for the initial patch.

Backport of r11938 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@11942 bcc190cf-cafb-0310-a4f2-bffc1f526a37