Motivation for this change

Adds support for the YubiKey OTP desktop app. Yubikeys are hardware authentication tokens you can use for 2FA. There's already some support in Nix.

The derivation should build without a Yubikey, you just won't be able to use it.

With YubiKey inserted.

jon@jdmt460s> ./result/bin/yubioath                             ~/nixos/nixpkgs
GitHub:ronmeredith      xxxxxx

And without

jon@jdmt460s> ./result/bin/yubioath                             ~/nixos/nixpkgs
Usage: yubioath show [OPTIONS] [QUERY]...

Error: No YubiKey found!

(apologies for the first pull request on this - it came from the wrong account so I close it)

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
  • macOS
  • 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.