DTRT with /var so that any packages installed are correctly recorded.

tools/tools/nanobsd/Makefile

@@ -145,11 +145,11 @@ buildimage:	_.md
 _.md:	_.cs
 	-umount ${WD}/dev > /dev/null 2>&1
 	chflags -R noschg ${WD} > /dev/null 2>&1
-	rm -rf ${WD}/var/* ${WD}/dev/* ${WD}/tmp
+	rm -rf ${WD}/dev/* ${WD}/tmp
 	# create trigger file for etc/rc.d/initdiskless
 	touch ${WD}/etc/diskless
 	mkdir -p ${WD}/conf/base/var
-	mtree -deU -f ${WD}/etc/mtree/BSD.var.dist -p ${WD}/conf/base/var
+	( cd ${WD}/var && find . -print | cpio -dumpl ../conf/base/var )
 	mkdir -p ${WD}/conf/base/etc
 	( cd ${WD}/etc && find . -print | cpio -dumpl ../conf/base/etc )
 	mkdir -p ${WD}/conf/default/etc