games/openbor: update to 3.0.r4504
- Add old slaves for some games (e.g. Ghosts'n Demons) based on http://www.chronocrash.com/forum/index.php?topic=2360.0
- Annotate .desktop file with build version
- Drop v3.0 from package version
- s/module/game/ in pkg-message for less ambiguity
Changes: https://github.com/DCurrent/openbor/compare/ba1eb4f...4dfdb66