Add support for setting mixerctl values in a sysctl.conf like manner

via mixerctl.conf.
ok deraadt@, earlier version ok henning@

src/etc/rc

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc,v 1.259 2004/11/03 18:04:46 henning Exp $
+#	$OpenBSD: rc,v 1.260 2004/11/22 09:26:23 jsg Exp $
 
 # System startup script run by init on autoboot
 # or after single-user.
@@ -171,6 +171,17 @@ if [ -f /etc/sysctl.conf ]; then
 )
 fi
 
+if [ -f /etc/mixerctl.conf ]; then
+(
+	# delete comments and blank lines
+	set -- `stripcom /etc/mixerctl.conf`
+	while [ $# -ge 1 ] ; do
+		mixerctl -q $1 > /dev/null 2>&1
+		shift
+	done
+)
+fi
+
 # set hostname, turn on network
 echo 'starting network'
 . /etc/netstart