patch 7.4.1479

Problem:    No testfor ":loadplugin".
Solution:   Add a test.  Fix how option is being set.

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1479,
 /**/
     1478,
 /**/