[1.3.x] Fixed #16481 -- Adapted one raw SQL query in cull implementation of...

[1.3.x] Fixed #16481 -- Adapted one raw SQL query in cull implementation of the database-based cache backend so it works with Oracle. Backport of r16635 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@17805 bcc190cf-cafb-0310-a4f2-bffc1f526a37