[Nix-dev] haxe-3 updates

[Marc Weber]

Posting about it so that interested people don't have to do the same
work.

Not sending a pull request because my patches depend on
https://github.com/NixOS/nixpkgs/pull/310

(should be easy for you to pick the changes you're interested in)

Most important is the change to installPhase (haxe) and the neko update
(in the end very trivial changes)

http://mawercer.de/tmp/haxe-3-patches.tar.gz

Marc Weber