Some 64 bits architectures support pointer aligned on 4 bytes

(where the sizeof(long) is 8). On such architectures dont
assert if the datatype representation is not aligned on 64 bits.

This commit was SVN r20134.

ompi/datatype/dt_args.c

@@ -228,11 +228,13 @@ int32_t ompi_ddt_set_args( ompi_datatype_t* pData,
              */
             OBJ_RETAIN( d[pos] );
             pArgs->total_pack_size += ((ompi_ddt_args_t*)d[pos]->args)->total_pack_size;
+#if OMPI_ALIGN_WORD_SIZE_INTEGERS
             /* as total_pack_size is always aligned to MPI_Aint size their sum
              * will be aligned to ...
              */
             assert( pArgs->total_pack_size ==
                     OPAL_ALIGN(pArgs->total_pack_size, sizeof(MPI_Aint), int) );
+#endif  /* OMPI_ALIGN_WORD_SIZE_INTEGERS */
         }
     }
     return MPI_SUCCESS;