Removed one test that is only intended for PostgreSQL from the visibility of other databases. This basically hides an annoying warning when running the tests under MySQL.
Removed one test that is only intended for PostgreSQL from the visibility of
other databases. This basically hides an annoying warning when running the
tests under MySQL.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%409649

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