compile fix on old versions of gcc with MPI enabled
compile fix on old versions of gcc with MPI enabled

kho/mr-cdec,kho/mr-cdec,pks/cdec-dtrain-legacy,pks/cdec-dtrain-legacy,kho/mr-cdec,kho/mr-cdec,pks/cdec-dtrain-legacy,pks/cdec-dtrain-legacy,kho/mr-cdec,pks/cdec-dtrain-legacy,pks/cdec-dtrain-legacy,kho/mr-cdec