Remove check for unused header
Remove check for unused header

nmathewson/mixminion,mixminion/mixminion,rxcomm/mixminion,nmathewson/mixminion,crooks/mixminion,rxcomm/mixminion,Javex/mixminion,crooks/mixminion,reezer/mixminion,reezer/mixminion,rxcomm/mixminion,crooks/mixminion,mixminion/mixminion,reezer/mixminion,Javex/mixminion,Javex/mixminion,nmathewson/mixminion,crooks/mixminion,mixminion/mixminion,nmathewson/mixminion,mixminion/mixminion,reezer/mixminion,rxcomm/mixminion,Javex/mixminion