MPI function deprecation warning

[PhilipDeegan]

SAMRAI_MPI.cpp:753:14: warning: 'MPI_Attr_get' is deprecated: MPI_Attr_get was deprecated in MPI-2.0; use MPI_Comm_get_attr instead [-Wdeprecated-declarations]
      rval = MPI_Attr_get(d_comm, keyval, attribute_val, flag);
             ^
/usr/local/Cellar/open-mpi/5.0.1/include/mpi.h:3025:13: note: 'MPI_Attr_get' has been explicitly marked deprecated here
            __mpi_interface_deprecated__("MPI_Attr_get was deprecated in MPI-2.0; use MPI_Comm_get_attr instead");
            ^
/usr/local/Cellar/open-mpi/5.0.1/include/mpi.h:302:78: note: expanded from macro '__mpi_interface_deprecated__'
#                    define __mpi_interface_deprecated__(msg) __attribute__((__deprecated__(msg)))