Function gio_sys::g_file_copy

pub unsafe extern "C" fn g_file_copy(
    source: *mut GFile, 
    destination: *mut GFile, 
    flags: GFileCopyFlags, 
    cancellable: *mut GCancellable, 
    progress_callback: GFileProgressCallback, 
    progress_callback_data: gpointer, 
    error: *mut *mut GError
) -> gboolean