[1.0.X] Fixed #10224: Don't attempt to decode binary string data in the Oracle...

[1.0.X] Fixed #10224: Don't attempt to decode binary string data in the Oracle backend. Backport of [9821] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9822 bcc190cf-cafb-0310-a4f2-bffc1f526a37