stdenv: support mainProgram in meta

Support `mainProgram` as an attribute of `meta` for packages.

This is an attribute used by [`nix
run`](https://nixos.org/manual/nix/unstable/command-ref/new-cli/nix3-run.html#description)
to customize the main program of a package.

For example, `pkgs.neovim` provides a `/bin/nvim` executable which users
would (almost certainly) prefer `nix run` to execute instead of a
non-existing `/bin/neovim`.

Signed-off-by: Ana Hobden <operator@hoverbear.org>

0 files changed, 0 insertions, 0 deletions