WIP: Antichamber

Antichamber only comes in 32-bit, and on 64-bit we need to cross-compile Mesa, but I'm not sure how to do it properly. My attempt in this patch only produces a 64-bit Mesa for some reason.

Same problem with gcc (we need it for stdc++).

UPDATE: The current patch seems to be compmlete (with regard to stdc++, libgl, etc.) but Antichamber fails to start with the issue mentioned below in the conversation. Could be a hardware problem, tests are welcome!