Function gobject_sys::g_signal_add_emission_hook

pub unsafe extern fn g_signal_add_emission_hook(signal_id: c_uint,
                                                detail: GQuark,
                                                hook_func: GSignalEmissionHook,
                                                hook_data: gpointer,
                                                data_destroy: GDestroyNotify)
                                                -> c_ulong