updated for version 7.4.057

Problem:    byteidx() does not work for composing characters.
Solution:   Add byteidxcomp().

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    57,
 /**/
     56,
 /**/