licenses: add GOG-EULA
games-rpg/arx-fatalis-data: update license to more generic GOG-EULA

Package-Manager: portage-2.2.12-r1
licenses: clean up obsolete ArxFatalis-EULA-GOG license

We moved this to GOG-EULA.
games-fps/duke3d-data: update license for gog USE flag
games-rpg/wasteland2: add GOG-EULA to LICENSES