Function gio_sys::g_dbus_proxy_new

pub unsafe extern fn g_dbus_proxy_new(connection: *mut GDBusConnection,
                                      flags: GDBusProxyFlags,
                                      info: *mut GDBusInterfaceInfo,
                                      name: *const c_char,
                                      object_path: *const c_char,
                                      interface_name: *const c_char,
                                      cancellable: *mut GCancellable,
                                      callback: GAsyncReadyCallback,
                                      user_data: gpointer)