updated for version 7.3.539

Problem:    Redrawing a character on the command line does not work properly
            for multi-byte charactes.
Solution:   Count the number of bytes in a character. (Yukihiro Nakadaira)

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    539,
 /**/
     538,
 /**/