sys/sys/chio.h: add NetBSD RCS ID.

Make it easier to identify the point where we started diverging from NetBSD. Newer versions of this file has been updated to a new license so this information may become useful some day. Obtained from: NetBSD
2017-12-28 14:26:33 +00:00 · 2017-12-28 14:26:33 +00:00 · 606e1c2893
commit 606e1c2893
parent cab3e1fc44
1 changed files with 2 additions and 0 deletions
--- a/sys/sys/chio.h
+++ b/sys/sys/chio.h
@ -1,3 +1,5 @@
+/*	$NetBSD: chio.h,v 1.9 1997/09/29 17:32:26 mjacob Exp $	*/
+
 /*-
 * SPDX-License-Identifier: BSD-4-Clause
 *