Refs #8901 -- Reverted r13328 because the patch imposes a minimum version requirement of Postgres 8.0; we can't impose that on Django 1.2, so we need to wait until the 1.3 is branched before we can apply this change.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13348 bcc190cf-cafb-0310-a4f2-bffc1f526a37