Function gio_2_0_sys::g_output_stream_write_bytes_async

pub unsafe extern "C" fn g_output_stream_write_bytes_async(
    stream: *mut GOutputStream, 
    bytes: *mut GBytes, 
    io_priority: gint, 
    cancellable: *mut GCancellable, 
    callback: Option<GAsyncReadyCallback>, 
    user_data: gpointer
)