updated for version 7.3.664

Problem:    Buffer overflow in unescaping text. (Raymond Ko)
Solution:   Limit check for multi-byte character to 4 bytes.

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    664,
 /**/
     663,
 /**/