add cross compile option for s2counter_loader
add cross compile option for s2counter_loader

daewon/incubator-s2graph,jongwook/incubator-s2graph,daewon/incubator-s2graph,jongwook/incubator-s2graph,SteamShon/incubator-s2graph,SteamShon/incubator-s2graph,SteamShon/incubator-s2graph