(stdenv) on Linux. The previous 1-stage bootstrap was insufficient,
because the tools in stdenv where built by native tools. For
instance, the Nix bash had a reference to /lib/libncurses. This
doesn't happen with a 2-stage bootstrap, since the bash built in
stage 2 will be built with the gcc built in stage 1, which doesn't
search in the "standard" locations.
Motto: "Disparaging the boot is a bootable offense."
svn path=/nixpkgs/trunk/; revision=809