After some CVS surgery to remove an unwise commit, restore some

post-UUCP-removal stuff:

1) Link cu(1) to tip(1).
2) Force removal of system immutable bit. (Was needed by UUCP's
   insecure cu(1).

usr.bin/tip/tip/Makefile

@@ -17,8 +17,9 @@ LIBACU=${.CURDIR}/../libacu/libacu.a
 PROG=	tip
 DPADD=	${LIBACU} ${LIBUTIL}
 LDADD=	${LIBACU} -lutil
-LINKS=	${BINDIR}/tip
+LINKS=	${BINDIR}/tip ${BINDIR}/cu
 MAN=	tip.1 modems.5
+MLINKS=	tip.1 cu.1
 SRCS=	acu.c acutab.c cmds.c cmdtab.c cu.c hunt.c log.c partab.c \
 	remote.c tip.c tipout.c value.c vars.c
 
@@ -26,9 +27,13 @@ BINDIR?=	/usr/bin
 BINOWN=		uucp
 BINGRP=		dialer
 #BINMODE?=	4510
-INSTALLFLAGS=	-fschg
 
 # XXX: there is some concern that `tip' in its current state shouldn't run
 #      SUID.  If it believed it should, the mode above may still no be proper.
 
+# Dirty, rotten hack. This can be removed when we are confident that there
+# is no cu(1) with the schg-bit set.
+beforeinstall:
+	-@chflags noschg ${DESTDIR}/${BINDIR}/cu
+
 .include <bsd.prog.mk>