Fix blackhole route installation on BSD
Fix blackhole route installation on BSD

Drooids/babeld,Gwendocg/babeldToS,wlanslovenija/babeld,tcatm/babeld,dtaht/babeld-shortrtt-metrics,jech/babeld,Gwendocg/babeldToS,wlanslovenija/babeld,jech/babeld,boutier/babeld,woniullb/babeld,sudomesh/babeld