Handle -DNO_ROOT for make compat in include/

Otherwise this step will fail on a Linux host due to missing "wheel" group

Approved By:	brooks (mentor)
Differential Revision: https://reviews.freebsd.org/D16841

include/Makefile

@@ -143,7 +143,7 @@ compat:
 		rm -f ${SDESTDIR}${INCLUDEDIR}/$i; \
 	fi
 .endfor
-	mtree -deU ${MTREE_FOLLOWS_SYMLINKS} \
+	mtree -deU ${NO_ROOT:D-W} ${MTREE_FOLLOWS_SYMLINKS} \
 	    -f ${SRCTOP}/etc/mtree/BSD.include.dist \
 	    -p ${SDESTDIR}${INCLUDEDIR} > /dev/null