updated for version 7.3.581
Problem:    Problems compiling with Python.
Solution:   Pick UCS2 or UCS4 function at runtime. (lilydjwg)
diff --git a/src/version.c b/src/version.c
index 29943e3..6fc8775 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    581,
+/**/
     580,
 /**/
     579,