[1.1.X] Fixed #11017: Changed implementation of Oracle LIKE lookups to enable...

[1.1.X] Fixed #11017: Changed implementation of Oracle LIKE lookups to enable index usage.  Thanks to Jani Tiainen for this workaround. Backport of r12293 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12294 bcc190cf-cafb-0310-a4f2-bffc1f526a37