Makefile uses 'make' recursively rather than $(MAKE)

[Seth Arnold]

http://bazaar.launchpad.net/~apparmor-dev/apparmor/master/view/head:/Makefile#L42
https://www.gnu.org/software/make/manual/html_node/Recursion.html
https://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html#MAKE-Variable

.PHONY: tarball
tarball: clean
 REPO_VERSION=`$(value REPO_VERSION_CMD)` ; \
 make export_dir __EXPORT_DIR=${RELEASE_DIR} __REPO_VERSION=$${REPO_VERSION} ; \
 make setup __SETUP_DIR=${RELEASE_DIR} ; \
 tar ${TAR_EXCLUSIONS} -cvzf ${RELEASE_DIR}.tar.gz ${RELEASE_DIR}
...

the "make export_dir" and so on should be $(MAKE) export_dir to use the job scheduling, -t -n -q options, and a specific 'make' path if one is used.

Thanks