Function mlx_fft_rfftn 

pub unsafe extern "C" fn mlx_fft_rfftn(
    res: *mut mlx_array,
    a: mlx_array,
    n: *const c_int,
    n_num: usize,
    axes: *const c_int,
    axes_num: usize,
    norm: mlx_fft_norm,
    s: mlx_stream,
) -> c_int