Add prototype.
Add prototype.

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