Don't change directory owner to root when building with -DNO_ROOT

Currently the mtree calls in Makefile.inc1 all change the directory owner
to match the spec file. However, we should not be doing this during
distributeworld if -DNO_ROOT is passed. Additionally, when creating the
WORLDTMP directory hierachy there is no need to change the owner to root so
we now always pass the -W flag when populating WORLDTMP.

This is also required for building FreeBSD on Linux/Mac since the required
groups/users will not exist there which is how I discovered this issue.

Reviewed By:	emaste, bdrewery, imp
Approved By:	brooks (mentor)
Differential Revision: https://reviews.freebsd.org/D14185

Makefile.libcompat

@@ -165,16 +165,16 @@ build${libcompat}: .PHONY
 .endif	# !defined(NO_CLEAN)
 
 	mkdir -p ${LIBCOMPATTMP}/usr/include
-	mtree -deU -f ${.CURDIR}/etc/mtree/BSD.usr.dist \
+	${WORLDTMP_MTREE} -f ${.CURDIR}/etc/mtree/BSD.usr.dist \
 	    -p ${LIBCOMPATTMP}/usr >/dev/null
-	mtree -deU -f ${.CURDIR}/etc/mtree/BSD.include.dist \
+	${WORLDTMP_MTREE} -f ${.CURDIR}/etc/mtree/BSD.include.dist \
 	    -p ${LIBCOMPATTMP}/usr/include >/dev/null
-	mtree -deU -f ${.CURDIR}/etc/mtree/BSD.lib${libcompat}.dist \
+	${WORLDTMP_MTREE} -f ${.CURDIR}/etc/mtree/BSD.lib${libcompat}.dist \
 	    -p ${LIBCOMPATTMP}/usr >/dev/null
 .if ${MK_DEBUG_FILES} != "no"
-	mtree -deU -f ${.CURDIR}/etc/mtree/BSD.debug.dist \
+	${WORLDTMP_MTREE} -f ${.CURDIR}/etc/mtree/BSD.debug.dist \
 	    -p ${LIBCOMPATTMP}/usr/lib >/dev/null
-	mtree -deU -f ${.CURDIR}/etc/mtree/BSD.lib${libcompat}.dist \
+	${WORLDTMP_MTREE} -f ${.CURDIR}/etc/mtree/BSD.lib${libcompat}.dist \
 	    -p ${LIBCOMPATTMP}/usr/lib/debug/usr >/dev/null
 .endif
 	mkdir -p ${WORLDTMP}