cleanup: Remove expired gupnp14 ports:

2023-11-30 net/gupnp14: Unsupported legacy version upstream, also fails to build with newer versions of libxml2. Consider migrating to net/gupnp
2023-11-30 net/gupnp-dlna: Depends on deprecated port net/gupnp14
2023-11-30 net/gupnp-igd12: Depends on deprecated port net/gupnp14