patch 7.4.1554

Problem:    Completion for :colorscheme does not use 'packpath'.
Solution:   Make it work, add a test. (Hirohito Higashi)

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1554,
 /**/
     1553,
 /**/