Cross compiling

[andrewchambers]

Cross compiling is an open question still, but I have some sketches of how it may look.

• One idea is a repository called xhpkgs which depends on hpkgs. In this xpkgs repository is some config about the target. This turns cross compiling into a specific and deliberate operation, that not all packages need to support. A main motivator for this approach is for deploying to lesser targets like raspberry pi, or router firmware from another machine.