MELBOURNE, March 31 : Nestory Irankunda scored a second-half double as Australia thrashed Curacao 5-1 in a friendly in Melbourne on Tuesday, giving fans a sweet farewell in their final home match before heading overseas to continue their World Cup buildup.  Livewire forward Irankunda struck twice in a five-minute burst from 80 minutes as the Socceroos ran riot with four goals after the break against the smallest country to qualify for the World Cup finals. Jordy Bos and Alessandro Circati also