Fixed #8841 -- Fixed a case of ForeignKeys to models constructed with

inheritance.

This patch is uglier than it needs to be (see comment in patch) to ensure no
accidental bug is introduced just before 1.0. We'll clean it up later.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8957 bcc190cf-cafb-0310-a4f2-bffc1f526a37