compiles on GPU. 3pt still wrong!!!!

Grid/qcd/utils/A2Autils.h

@@ -1047,7 +1047,7 @@ A2Autils<FImpl>::ContractWWVV(std::vector<PropagatorField> &WWVV,
 {
   GridBase *grid = vs[0].Grid();
 
-  int nd    = grid->_ndimension;
+  //int nd    = grid->_ndimension;
   int Nsimd = grid->Nsimd();
   int N_t = WW_sd.dimensions()[0];
   int N_s = WW_sd.dimensions()[1];