gnupg: 2.1.22 -> 2.1.23

This release in a RC for gnupg-2.2. The main difference as far as
nixpkgs is concerned is that the binary `gpg2` is now called `gpg` and
`gpgv2` is called `gpgv`.

This update fixed all explicit use of `gpg2` and `gpgv2` across nixpkgs,
but there might be some packaged software that internally use `gpg2`
not handeled by this commit.

See http://lists.gnu.org/archive/html/info-gnu/2017-08/msg00001.html
for full release information

pkgs/tools/security/gnupg/1compat.nix

@@ -12,10 +12,6 @@ stdenv.mkDerivation {
     ${coreutils}/bin/rm $out/bin
     ${coreutils}/bin/mkdir -p $out/bin
     ${coreutils}/bin/ln -s "${gnupg}/bin/"* $out/bin
-
-    # Add gpg->gpg2 and gpgv->gpgv2 symlinks
-    ${coreutils}/bin/ln -s gpg2 $out/bin/gpg
-    ${coreutils}/bin/ln -s gpgv2 $out/bin/gpgv
   '';
 
   meta = gnupg.meta // {