remove useless header file
remove useless header file

ajjl/mlpack,darcyliu/mlpack,ajjl/mlpack,ranjan1990/mlpack,theranger/mlpack,ranjan1990/mlpack,darcyliu/mlpack,darcyliu/mlpack,ranjan1990/mlpack,palashahuja/mlpack,theranger/mlpack,ajjl/mlpack,theranger/mlpack,palashahuja/mlpack,palashahuja/mlpack