[1.0.X] Remove download_url from setup.py, since that only applies to the...

[1.0.X] Remove download_url from setup.py, since that only applies to the specific revision we packaged as 1.0.3.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@11372 bcc190cf-cafb-0310-a4f2-bffc1f526a37