build.sh: Fail if curl is used and URL is a 404
build.sh: Fail if curl is used and URL is a 404

DanielNeugebauer/adhocracy,alkadis/vcv,phihag/adhocracy,alkadis/vcv,SysTheron/adhocracy,SysTheron/adhocracy,SysTheron/adhocracy,phihag/adhocracy,alkadis/vcv,liqd/adhocracy,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy,alkadis/vcv,phihag/adhocracy,phihag/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy,liqd/adhocracy,DanielNeugebauer/adhocracy,alkadis/vcv,liqd/adhocracy,liqd/adhocracy