Recently, we made it harder for external code to use some stdenv-only bash
variables by unsetting them in [1] But Lua's `withPackages` was sourcing some
setup hooks in [2], which required those bash variables.
I say great! We caught something bad: Lua should use normal dependencies, even
though that is harder with `buildEnv`. Now it works that way, and everything is
fine.
[1]: 9d3911f806/pkgs/stdenv/generic/setup.sh (L574-L578)
[2]: 9d3911f806/pkgs/development/interpreters/lua-5/wrapper.nix (L23-L27)
CC @matthewbauer
a610a38cb5