[1.0.X] Fixed #10757 -- Fixed improper selection of primary keys across...

[1.0.X] Fixed #10757 -- Fixed improper selection of primary keys across relations when using `GeoManager.values`.  Thanks, David Gouldin for ticket and initial patch.

Backport of r10434 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10437 bcc190cf-cafb-0310-a4f2-bffc1f526a37