patch 8.2.3641: xxd code has duplicate expressions

Problem:    Xxd code has duplicate expressions.
Solution:   Refactor to avoid duplication. (closes #9185)
diff --git a/src/version.c b/src/version.c
index a83ff61..99c8a26 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3641,
+/**/
     3640,
 /**/
     3639,