patch 8.2.3523: duplicated code in xxd

Problem:    Duplicated code in xxd.
Solution:   Remove duplicated lines. (closes #8972)
diff --git a/src/version.c b/src/version.c
index 1b6e997..8048f8e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3523,
+/**/
     3522,
 /**/
     3521,