updated for version 7.4.189

Problem:    Compiler warning for unused argument.
Solution:   Add UNUSED.

src/eval.c

@@ -9203,7 +9203,7 @@ f_byte2line(argvars, rettv)
 byteidx(argvars, rettv, comp)
     typval_T	*argvars;
     typval_T	*rettv;
-    int		comp;
+    int		comp UNUSED;
 {
 #ifdef FEAT_MBYTE
     char_u	*t;

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    189,
 /**/
     188,
 /**/