emacsPackagesNg doesn't seem to install bin folder

[bendlas]

Issue description

When a package from emacsPackages creates a bin folder, the corresponding package from emacsPackageNg, doesn't.

cc @ttuegel @mdorman

Steps to reproduce

Example:

± tree $(nix-build . -A emacsPackages.cask)
/nix/store/mjm4wm16mildqgp0hz3g1jkcrbwv0zv1-cask-0.8.4
├── bin
│   └── cask
├── cask-bootstrap.el -> /nix/store/mjm4wm16mildqgp0hz3g1jkcrbwv0zv1-cask-0.8.4/share/emacs/site-lisp/cask-bootstrap.el
├── cask-cli.el -> /nix/store/mjm4wm16mildqgp0hz3g1jkcrbwv0zv1-cask-0.8.4/share/emacs/site-lisp/cask-cli.el
├── cask.el -> /nix/store/mjm4wm16mildqgp0hz3g1jkcrbwv0zv1-cask-0.8.4/share/emacs/site-lisp/cask.el
├── share
│   └── emacs
│       └── site-lisp
│           ├── cask-bootstrap.el
│           ├── cask-cli.el
│           └── cask.el
└── templates
    ├── init-dev.tpl
    └── init.tpl

5 directories, 9 files

± tree $(nix-build . -A emacsPackagesNg.cask)
/nix/store/4dkrqn8chx7jfhrv4wpck96pdpl9wlaq-emacs-cask-20180119.1906
├── nix-support
│   ├── propagated-build-inputs
│   ├── propagated-user-env-packages
│   └── setup-hook
└── share
    └── emacs
        └── site-lisp
            └── elpa
                └── cask-20180119.1906
                    ├── cask-autoloads.el
                    ├── cask-bootstrap.el
                    ├── cask-bootstrap.elc
                    ├── cask-cli.el
                    ├── cask.el
                    ├── cask-pkg.el
                    ├── package-legacy.el
                    └── package-legacy.elc

6 directories, 11 files

Technical details

± nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 4.17.4, NixOS, 18.09pre-git (Jellyfish)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.0.4`
 - channels(root): `"nixos-15.09.636.8c44b45"`
 - nixpkgs: `/etc/nixos/pkgs`

[stale]

Thank you for your contributions.

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[ttuegel]

This is an intentional difference: The emacsPackagesNg package contains only the Emacs mode. Projects that have other components should be packaged separately; for example, there is a cask package.