Fixed #10256 -- Corrected the interaction of extra(select=) with values() and...

Fixed #10256 -- Corrected the interaction of extra(select=) with values() and values_list() where an explicit list of columns is requested.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9837 bcc190cf-cafb-0310-a4f2-bffc1f526a37