Convert mt(1) and libmt to LIBADD

While here fix missing link to libbsdxml for libmt
Fix overlinking in mt(1)
Make add an indirect libmt dependency on bsdxml to allow static linking if
needed

lib/libmt/Makefile

@@ -5,8 +5,7 @@ SHLIBDIR?=	/lib
 SRCS=		mtlib.c
 INCS=		mtlib.h
 
-DPADD=		${LIBSBUF}
-LDADD=		-lsbuf
+LIBADD=		sbuf bsdxml
 
 MAN=		mt.3
 

share/mk/src.libnames.mk

@@ -111,6 +111,7 @@ _LIBRARIES=	\
 		md \
 		memstat \
 		mp \
+		mt \
 		nandfs \
 		ncurses \
 		ncursesw \
@@ -199,6 +200,7 @@ _DP_proc+=	ctf
 _DP_mp=	crypto
 _DP_memstat=	kvm
 _DP_magic=	z
+_DP_mt=		bsdxml
 _DP_ldns=	crypto
 .if ${MK_OPENSSL} != "no"
 _DP_fetch=	ssl crypto
@@ -259,6 +261,9 @@ LDADD_atf_cxx+=	${LDADD_atf_c}
 DPADD_ipf+=	${DPADD_kvm}
 LDADD_ipf+=	${LDADD_kvm}
 
+DPADD_mt+=	${DPADD_sbuf}
+LDADD_mt+=	${LDADD_sbuf}
+
 # The following depends on libraries which are using pthread
 DPADD_hdb+=	${DPADD_pthread}
 LDADD_hdb+=	${LDADD_pthread}

usr.bin/mt/Makefile

@@ -2,7 +2,6 @@
 # $FreeBSD$
 
 PROG=	mt
-DPADD=	${LIBMT} ${LIBSBUF} ${LIBBSDXML}
-LDADD=	-lmt -lsbuf -lbsdxml
+LIBADD=	mt
 
 .include <bsd.prog.mk>