Fixed signature of BaseDatabaseOperations.date_interval_sql()

Backport of 7fa7dd48c4 from master

django/db/backends/base/operations.py

@@ -75,7 +75,7 @@ class BaseDatabaseOperations(object):
         """
         raise NotImplementedError('subclasses of BaseDatabaseOperations may require a date_extract_sql() method')
 
-    def date_interval_sql(self, sql, connector, timedelta):
+    def date_interval_sql(self, timedelta):
         """
         Implements the date interval functionality for expressions
         """

docs/releases/1.8.txt

@@ -1013,6 +1013,9 @@ those writing third-party backends in updating their code:
 * The ``SQLCompiler.as_sql()`` method now takes a ``subquery`` parameter
   (:ticket:`24164`).
 
+* The ``BaseDatabaseOperations.date_interval_sql()`` method now only takes a
+  ``timedelta`` parameter.
+
 :mod:`django.contrib.admin`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~