patch 8.2.3594: xxd code is a bit difficult to understand

Problem:    Xxd code is a bit difficult to understand.
Solution:   Move some lines to a separate function. (closes #9037)
diff --git a/src/version.c b/src/version.c
index 1664f21..0374843 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3594,
+/**/
     3593,
 /**/
     3592,