maphosts: init at 1.1.1

[mpscholten]

Motivation for this change

Adds the maphosts package.

Open question:

• I was following the wiki page on how to bundle a ruby gem. The issue is that when installing the maphosts package, it will also provide a bundler binary. E.g. jekyll does the same. So when installing jekyll and maphosts you will have a conflict because both packages provide bundler. So how should this be handled? IMO no ruby package should provide the bundler binary by default.
• Is it ok if I add myself as a maintainer of the package? Did not found any documentation on this :)

Things done

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • OS X
  • Linux
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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[mention-bot]

By analyzing the blame information on this pull request, we identified @zimbatm, @edolstra and @peti to be potential reviewers

[zimbatm]

@mpscholten one way to do it is wrap the buildEnv in another derivation to expose just the binary you want. See the cide package for example.

[mpscholten]

@zimbatm thanks for pointing me in the right direction :) Just created a pr to implement this: #16676