Function gio_sys::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
)