updated for version 7.3.721
Problem:    Ruby interface defines local functions globally.
Solution:   Make the functions static.
diff --git a/src/version.c b/src/version.c
index 6b2919a..fdac7f1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -726,6 +726,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    721,
+/**/
     720,
 /**/
     719,