patch 7.4.889

Problem:    Triggering OptionSet from setwinvar() isn't tested.
Solution:   Add a test. (Christian Brabandt)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    889,
 /**/
     888,
 /**/