patch 8.2.3680: repeated code in xxd

Problem:    Repeated code in xxd.
Solution:   Change exit_on_ferror() to getc_or_die(). (closes #9226)
diff --git a/src/version.c b/src/version.c
index ca0f16f..31c2520 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3680,
+/**/
     3679,
 /**/
     3678,