Add missing suite level requirements from 2efd89d029

In 2efd89d029 we added
suite-level requirements but did not add them to the
base, causing failures in third party dialect test suites.

Change-Id: Ic5f1a053f5c47166e1b12c613595823106c8736e
(cherry picked from commit 33648643f2)

lib/sqlalchemy/testing/requirements.py

@@ -789,6 +789,16 @@ class SuiteRequirements(Requirements):
         """
         return exclusions.closed()
 
+    @property
+    def order_by_col_from_union(self):
+        """target database supports ordering by a column from a SELECT
+        inside of a UNION
+
+        E.g.  (SELECT id, ...) UNION (SELECT id, ...) ORDER BY id
+
+        """
+        return exclusions.open()
+
     @property
     def order_by_label_with_expression(self):
         """target backend supports ORDER BY a column label within an