Prevented InsertQuery from appending a 'RETURNING' clause when it's not actually interested in the result.  This was causing some problems for Oracle.
Prevented InsertQuery from appending a 'RETURNING' clause when it's not actually interested in the result.  This was causing some problems for Oracle.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%4010047

adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel