Add an end-of-tests marker to ease merges

mysql-test/r/win.result

@@ -3505,3 +3505,6 @@ id	a	b	sum_a_b
 2	2	1	3
 2	2	2	4
 drop table t1;
+#
+# End of 10.2 tests
+#

mysql-test/t/win.test

@@ -2254,3 +2254,7 @@ select e.id,
  (select max(t1.v) from t1 where t1.id=e.id) + (row_number() over (partition by e.id order by e.v)) as sum_a_b
 from t1 e;
 drop table t1;
+
+--echo #
+--echo # End of 10.2 tests
+--echo #