Fixed #10064 -- Corrected handling of aggregate queries that also use...

Fixed #10064 -- Corrected handling of aggregate queries that also use select_related(). Thanks to olivius for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9781 bcc190cf-cafb-0310-a4f2-bffc1f526a37