added no arch so we don't need to make a bunch of seperate builds

[mikemhenry]

No description provided.

[mattwthompson]

So when we ship to anaconda.org, will this only build one version - does this create a conflict in which it's not clear which versions we support? Because along those lines I would be in favor of building specific versions that we officially support but also a noarch version that we throw out to users with no guarantees.