patch 7.4.1480

Problem:    Cannot add a pack direcory without loading a plugin.
Solution:   Add the :packadd command.

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1480,
 /**/
     1479,
 /**/