build: fix rpm build to include corosync-blackbox

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Steven Dake <sdake@redhat.com>

corosync.spec.in

@@ -98,6 +98,7 @@ fi
 %files
 %defattr(-,root,root,-)
 %doc LICENSE SECURITY
+%{_bindir}/corosync-blackbox
 %{_sbindir}/corosync
 %{_sbindir}/corosync-keygen
 %{_sbindir}/corosync-objctl