use MPI_Type_create_struct instead of MPI_Type_struct with MPI>=2

dune/common/parallel/indicessyncer.hh

@@ -657,7 +657,11 @@ namespace Dune
     displacement[0] -= base;
     displacement[1] -= base;
 
+    #if MPI_2
+    MPI_Type_create_struct( 2, blocklength, displacement, type, &datatype_);
+    #else
     MPI_Type_struct( 2, blocklength, displacement, type, &datatype_);
+    #endif
     MPI_Type_commit(&datatype_);
   }
 

dune/common/parallel/plocalindex.hh

@@ -305,7 +305,11 @@ namespace Dune
       #endif
       for(int i=2; i >= 0; --i)
         disp[i] -= disp[0];
+      #if MPI_2
+      MPI_Type_create_struct(3, length, disp, types, &type);
+      #else
       MPI_Type_struct(3, length, disp, types, &type);
+      #endif
       MPI_Type_commit(&type);
     }
     return type;

dune/common/parallel/remoteindices.hh

@@ -904,7 +904,11 @@ namespace Dune {
       #endif
       for(int i=3; i >= 0; --i)
         disp[i] -= disp[0];
+      #if MPI_2
+      MPI_Type_create_struct(4, length, disp, types, &type);
+      #else
       MPI_Type_struct(4, length, disp, types, &type);
+      #endif
       MPI_Type_commit(&type);
     }
     return type;