patch 9.0.0473: fullcommand() only works for the current script version

Problem:    fullcommand() only works for the current script version.
Solution:   Add an optional argument for the script version.
diff --git a/src/version.c b/src/version.c
index 77af684..3f25033 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    473,
+/**/
     472,
 /**/
     471,