patch 7.4.1678

Problem:    Warning for unused argument.
Solution:   Add UNUSED. (Dominique Pelle)

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1678,
 /**/
     1677,
 /**/