Function mpi::ffi::OMPI_C_MPI_COMM_DUP_FN

pub unsafe extern fn OMPI_C_MPI_COMM_DUP_FN(comm: MPI_Comm,
                                            comm_keyval: c_int,
                                            extra_state: *mut c_void,
                                            attribute_val_in: *mut c_void,
                                            attribute_val_out: *mut c_void,
                                            flag: *mut c_int)
                                            -> c_int