Function mpi::ffi::MPI_Neighbor_allgatherv

pub unsafe extern fn MPI_Neighbor_allgatherv(sendbuf: *const c_void,
                                             sendcount: c_int,
                                             sendtype: MPI_Datatype,
                                             recvbuf: *mut c_void,
                                             recvcounts: *const c_int,
                                             displs: *const c_int,
                                             recvtype: MPI_Datatype,
                                             comm: MPI_Comm)
                                             -> c_int