Arx Libertatis 1.1.2 (new formula)

Arx Libertatis is a cross-platform, open source port of Arx Fatalis, a 2002 first-person role-playing game / dungeon crawler developed by Arkane Studios.

[Arx Fatalist demo](http://wiki.arx-libertatis.org/Getting_the_game_data#Demo)
Ah, okay. Maybe makes sense to make the caveats conditional on `if build.with? "innoextract"` in that case?