big <utmp.h>-inspired netbsd switch

import/switch of:
init, getty, reboot, halt, shutdown, wall, last

changes:
	. change reboot() call to netbsd prototype and args
	. allows pristine <utmp.h>
	. use clean <sys/reboot.h> instead of <minix/reboot.h>
	. implement TIOCSCTTY for use by getty so getty can get
	  controlling terminal from init's child(ren)
	. allow NULL envp for exec

Change-Id: I5ca02cb4230857140c08794bbfeba7df982c58a3

sbin/init/Makefile

@@ -0,0 +1,18 @@
+#	$NetBSD: Makefile,v 1.38 2009/04/11 07:58:12 lukem Exp $
+#	@(#)Makefile	8.1 (Berkeley) 7/19/93
+
+PROG=	init
+MAN=	init.8
+DPADD=	${LIBUTIL}
+LDADD=	-lutil
+CPPFLAGS+=	-DMFS_DEV_IF_NO_CONSOLE -DSUPPORT_UTMP -DSUPPORT_UTMPX
+
+.ifdef	SMALLPROG
+CPPFLAGS+=	-DLETS_GET_SMALL
+.else
+CPPFLAGS+=	-DALTSHELL -DSECURE -DCHROOT
+DPADD+=		${LIBCRYPT}
+LDADD+=		-lcrypt
+.endif
+
+.include <bsd.prog.mk>