gnupg: 2.2.2 -> 2.2.3

[lsix]

This is a maintenance release.
See http://lists.gnu.org/archive/html/info-gnu/2017-11/msg00008.html
for release information

This should probably back-ported to release-17.09 once merged.

Motivation for this change

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
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• 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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[adisbladis]

Backported in 25043fb
Thanks :)