patch 7.4.1574

Problem:    ":undo 0" does not work. (Florent Fayolle)
Solution:   Make it undo all the way. (closes #688)

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1574,
 /**/
     1573,
 /**/