Rename usr.sbin/mtree to usr.sbin/fmtree since it is not what /usr/sbin/mtree

actually is (which is usr.sbin/nmtree).

This has tricked me numerous times.

targets/pseudo/userland/Makefile.depend

@@ -512,6 +512,7 @@ DIRDEPS+= \
 	usr.sbin/fifolog/fifolog_writer \
 	usr.sbin/fifolog/fifolog_reader \
 	usr.sbin/flowctl \
+	usr.sbin/fmtree \
 	usr.sbin/freebsd-update \
 	usr.sbin/fwcontrol \
 	usr.sbin/genrandom \
@@ -567,7 +568,6 @@ DIRDEPS+= \
 	usr.sbin/mpsutil \
 	usr.sbin/mptutil \
 	usr.sbin/mtest \
-	usr.sbin/mtree \
 	usr.sbin/named \
 	usr.sbin/named-checkconf \
 	usr.sbin/named-checkzone \

usr.sbin/Makefile

@@ -155,7 +155,7 @@ SUBDIR+=	fdwrite
 .endif
 
 .if ${MK_FMTREE} != "no"
-SUBDIR+=	mtree
+SUBDIR+=	fmtree
 .endif
 
 .if ${MK_FREEBSD_UPDATE} != "no"