updated for version 7.3.503
Problem:    Warning for unused argument.
Solution:   Add UNUSED.
diff --git a/src/version.c b/src/version.c
index 7bce146..ea9bc62 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    503,
+/**/
     502,
 /**/
     501,