[1.1.X] Added Pyton 2.3 compatibility import for use of set by some n…

…ew tests.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12961 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/queries/tests.py

@@ -1,4 +1,8 @@
 import unittest
+try:
+    set
+except NameError:
+    from sets import Set as set
 
 from django.db import DatabaseError, connection
 from django.db.models import Count