add entries for 4/300 extra serial ports

src/etc/etc.sparc/MAKEDEV

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: MAKEDEV,v 1.35 1998/01/26 04:19:49 dgregor Exp $
+#	$OpenBSD: MAKEDEV,v 1.36 1998/02/23 05:29:17 jason Exp $
 #
 # Copyright (c) 1990 The Regents of the University of California.
 # All rights reserved.
@@ -199,6 +199,8 @@ std)
 	mknod stderr		c 24 2	; chmod 666 stderr
 	mknod ttya		c 12 0
 	mknod ttyb		c 12 1
+	mknod ttyc		c 12 4
+	mknod ttyd		c 12 5
 	mknod fb		c 22 0 ; chmod 666 fb
 	mknod mouse		c 13 0 ; chmod 666 mouse
 	mknod kbd		c 29 0 ; chmod 666 kbd

src/etc/etc.sparc/ttys

@@ -1,8 +1,10 @@
 #
-#	$OpenBSD: ttys,v 1.3 1997/10/11 21:22:19 deraadt Exp $
+#	$OpenBSD: ttys,v 1.4 1998/02/23 05:29:17 jason Exp $
 #
 # name	getty				type	status		comments
 #
 console	"/usr/libexec/getty suncons"	sun	on secure
 ttya	"/usr/libexec/getty std.9600"	unknown	off secure
 ttyb	"/usr/libexec/getty std.9600"	unknown	off secure
+ttyc	"/usr/libexec/getty std.9600"	unknown	off secure
+ttyd	"/usr/libexec/getty std.9600"	unknown	off secure