Nice-0.1 GIR contains unexported functions

[ianprime0509]

The following functions are not exported from libnice, but are present in the GIR (see https://gitlab.freedesktop.org/libnice/libnice/-/blob/1a7b83a3eb0cfe905d8c20d54a81b40a284fb91d/nice/libnice.sym for exported functions):

• pseudo_tcp_socket_can_send
• pseudo_tcp_socket_get_available_bytes
• pseudo_tcp_socket_get_available_send_space
• pseudo_tcp_socket_notify_message
• pseudo_tcp_socket_set_time