Remove old compatibility shims from d.c.gis.

django/contrib/gis/models.py

-from django.db import connection
-
-if (hasattr(connection.ops, 'spatial_version') and
-        not connection.ops.mysql):
-    # Getting the `SpatialRefSys` and `GeometryColumns`
-    # models for the default spatial backend.  These
-    # aliases are provided for backwards-compatibility.
-    SpatialRefSys = connection.ops.spatial_ref_sys()
-    GeometryColumns = connection.ops.geometry_columns()

docs/releases/1.8.txt

@@ -46,7 +46,8 @@ Minor features
 :mod:`django.contrib.gis`
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-* ...
+* Compatibility shims for ``SpatialRefSys`` and ``GeometryColumns`` changed in
+  Django 1.2 have been removed.
 
 :mod:`django.contrib.messages`
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^