patch 7.4.1499

Problem:    No error message when :packadd does not find anything.
Solution:   Add an error message. (Hirohito Higashi)

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1499,
 /**/
     1498,
 /**/