[1.0.X] Fixed another case of reverse URL resolving that wasn't working.

This is a similar situation to that fixed in r9087. We weren't merging
multiple levels of include() calls together correctly.

Backported from r9099 on trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9100 bcc190cf-cafb-0310-a4f2-bffc1f526a37