Fixed #5636 -- Added missing Set import for Python2.3 support. Thanks, wangchun@exoweb.net.
Fixed #5636 -- Added missing Set import for Python2.3 support. Thanks, wangchun@exoweb.net.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%406438

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