Function gio_sys::g_output_stream_write_bytes_async

pub unsafe extern fn g_output_stream_write_bytes_async(stream: *mut GOutputStream,
                                                       bytes: *mut GBytes,
                                                       io_priority: c_int,
                                                       cancellable: *mut GCancellable,
                                                       callback: GAsyncReadyCallback,
                                                       user_data: gpointer)