Disable setuid permission for mount_union(1).

This covers the security problem descibed in SA-96:10 and Jeff says that
when we upgrade to Lite2 (which fixes this problem), mount no longer needs
to be setuid, so we'll never be going back.

Submitted by:	hsu
Reviewed by:    pst

sbin/mount_union/Makefile

@@ -8,7 +8,4 @@ MOUNT=	${.CURDIR}/../mount
 CFLAGS+= -I${.CURDIR}/../../sys -I${MOUNT}
 .PATH:	${MOUNT}
 
-BINOWN= root
-BINMODE=4555
-
 .include <bsd.prog.mk>

sbin/mount_unionfs/Makefile

@@ -8,7 +8,4 @@ MOUNT=	${.CURDIR}/../mount
 CFLAGS+= -I${.CURDIR}/../../sys -I${MOUNT}
 .PATH:	${MOUNT}
 
-BINOWN= root
-BINMODE=4555
-
 .include <bsd.prog.mk>