removed unix-only header include for windows compatibility
removed unix-only header include for windows compatibility

sheim/drake,scottviteri/drake,billhoffman/drake,scottviteri/drake,billhoffman/drake,sheim/drake,thientu/drake,crogers3/drake,crogers3/drake,crogers3/drake,thientu/drake,scottviteri/drake,hanssusilo/drake,thientu/drake,hanssusilo/drake,crogers3/drake,edowson/drake,sheim/drake,thientu/drake,edowson/drake,hanssusilo/drake,thientu/drake,sheim/drake,hanssusilo/drake,hanssusilo/drake,scottviteri/drake,crogers3/drake,hanssusilo/drake,psiorx/drake,psiorx/drake,psiorx/drake,billhoffman/drake,edowson/drake,edowson/drake,billhoffman/drake,billhoffman/drake,psiorx/drake,scottviteri/drake,scottviteri/drake,thientu/drake,psiorx/drake,sheim/drake,crogers3/drake,billhoffman/drake,sheim/drake,edowson/drake,psiorx/drake,sheim/drake,scottviteri/drake,thientu/drake,hanssusilo/drake,edowson/drake,sheim/drake,edowson/drake,psiorx/drake,crogers3/drake,psiorx/drake,crogers3/drake,billhoffman/drake,billhoffman/drake,hanssusilo/drake,edowson/drake