Add Obsolete-since header to hashcash.el

* lisp/obsolete/hashcash.el: Add Obsolete-since header.  (Bug#76195)

(cherry picked from commit 706970fc25de34fd63c21bed13e31e96ae258a28)

diff --git a/lisp/obsolete/hashcash.el b/lisp/obsolete/hashcash.el
index fac336bb6cc282f7e722bdf0dc25156bf9db7cfe..cd111b8d8c5b1ed6ea9727ebcb216b32a7def4c8 100644 (file)
--- a/lisp/obsolete/hashcash.el
+++ b/lisp/obsolete/hashcash.el
@@ -5,6 +5,7 @@
 ;; Written by: Paul Foley <mycroft@actrix.gen.nz> (1997-2002)
 ;; Maintainer: emacs-devel@gnu.org
 ;; Keywords: mail, hashcash
+;; Obsolete-since: 31.1
 
 ;; This file is part of GNU Emacs.