Function g_file_copy_async

pub unsafe extern "C" fn g_file_copy_async(
    source: *mut GFile,
    destination: *mut GFile,
    flags: GFileCopyFlags,
    io_priority: c_int,
    cancellable: *mut GCancellable,
    progress_callback: GFileProgressCallback,
    progress_callback_data: gpointer,
    callback: GAsyncReadyCallback,
    user_data: gpointer,
)