[Nix-dev] x-updates

[Mathijs Kwik]

Hi all,

I just had to push a non-X-related package to x-updates because it
needs llvm 3.3.
This is probably a sign that things got tangled a bit.

We can either:
- provide multiple versions for llvm in master
- avoid package upgrades that depend on llvm 3.3
- merge x-updates soon

I know x-updates was merged quite recently and not a whole lot got
added this iteration, but perhaps that's a good thing?
I've been running a merge of master with x-updates on 3 systems since
the previous merge with no issues, but as there is no X project on
hydra currently, I don't know if there are any showstoppers for other
people.

Mathijs