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.
diff --git a/src/version.c b/src/version.c
index 34bba78..dd6700d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    521,
+/**/
     520,
 /**/
     519,