updated for version 7.3.664
Problem:    Buffer overflow in unescaping text. (Raymond Ko)
Solution:   Limit check for multi-byte character to 4 bytes.
diff --git a/src/version.c b/src/version.c
index 43d1161..d8ada69 100644
--- a/src/version.c
+++ b/src/version.c
@@ -720,6 +720,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    664,
+/**/
     663,
 /**/
     662,