revert "CCpp-turn-off-compat-cores" commit
    
    The commit 10a3ff45b150fe426624080abf903242af3ac201 was accidentally backported
    to f23. It make sense only if systemd>=229.
    
    Resolves #1330734
    
    Signed-off-by: Matej Habrnal <mhabrnal@redhat.com>