$NetBSD: patch-COPYING,v 1.1 2023/04/22 00:58:05 manu Exp $

cmake wants a COPYING file, give it one

--- COPYING.orig	2022-04-13 17:05:12.791212716 +0200
+++ COPYING	2022-04-13 17:05:02.802756303 +0200
@@ -0,0 +1 @@
+Placeholder to please cmake