updated for version 7.3.521

Problem:    Using "z=" on a multi-byte character may cause a crash.
Solution:   Don't use strlen() on an int pointer.

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    521,
 /**/
     520,
 /**/