[Nix-dev] [pull request] Update gnutls to 3.1.10 (fixes security vulnerability)

[James Cook]

I updated GnuTLS to 3.1.10 on my system.  I nixos-rebuild-ed on the
branch and restarted and everything works fine, so I made a pull
request:

https://github.com/NixOS/nixpkgs/pull/478

Thanks,
  James