Function gio_sys::g_socket_client_connect_to_uri_async

pub unsafe extern fn g_socket_client_connect_to_uri_async(client: *mut GSocketClient,
                                                          uri: *const c_char,
                                                          default_port: u16,
                                                          cancellable: *mut GCancellable,
                                                          callback: GAsyncReadyCallback,
                                                          user_data: gpointer)