Revert "ed: update to 1.10 (close #3852)"

This reverts commit 60902b97fe4a96d370bc0c5e3690fa45da77d78d. It
breaks building on Darwin:

  http://hydra.nixos.org/build/13832410

It also adds a gratuitous dependency to the stdenv bootstrap.
Revert "stdenv/setup.sh: unbreak *.lz sources on darwin"

This reverts commit fcafdd27616b91049c506441802b9cfe970388d4. We're
trying to modularise stdenv, not add more ad-hoc compression support.
ed: update to 1.10, working around *.lz problem