[1.1.X] Fixed #13256 -- `OGRGeometry` no longer raises an exception when...

[1.1.X] Fixed #13256 -- `OGRGeometry` no longer raises an exception when compared to instances of different types.  Thanks, ninowalker for the bug report.

Backport of r12905 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12906 bcc190cf-cafb-0310-a4f2-bffc1f526a37