Use $(SHELL) to run it. Someone may want to build out of a source tree
in a filesystem with the noexec mount flag set.
Signed-off-by: Matthieu Herrb <matthieu.herrb@laas.fr>
Reviewed-by: Gaetan Nadon <memsize@videotron.ca>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>