Function gst::ffi::g_signal_handler_find

pub unsafe extern "C" fn g_signal_handler_find(
    instance: gpointer, 
    mask: GSignalMatchType, 
    signal_id: guint, 
    detail: GQuark, 
    closure: *mut GClosure, 
    func: gpointer, 
    data: gpointer
) -> gulong