Refs #6013 - Allow modularized policy via DISTRO m4 macro

This is for: https://github.com/theforeman/foreman-selinux/pull/26
Uh, yeah. These macros... ;-)

Thanks. Scratch build with the required patch:

http://koji.katello.org/koji/taskinfo?taskID=139104

-- 
Later,
 Lukas #lzap Zapletal