Log Message:
Add games/stone-soup and games/stone-soup-sdl.

Based partially on work by Yorick Hardy in pkgsrc-wip.

Dungeon Crawl Stone Soup is an open-source, single-player, role-playing
roguelike game of exploration and treasure-hunting in dungeons filled with
dangerous and unfriendly monsters in a quest to rescue the mystifyingly
fabulous Orb of Zot.