updated for version 7.4.478

Problem:    Using byte length instead of character length for 'showbreak'.
Solution:   Compute the character length. (Marco Hinz)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    478,
 /**/
     477,
 /**/