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/misc/pipelight/default.nix

@@ -30,7 +30,7 @@ in stdenv.mkDerivation rec {
       --prefix=$out \
       --moz-plugin-path=$out/${mozillaPluginPath} \
       --wine-path=${wine_custom} \
-      --gpg-exec=${gnupg}/bin/gpg2 \
+      --gpg-exec=${gnupg}/bin/gpg \
       --bash-interp=${bash}/bin/bash \
       --downloader=${curl.bin}/bin/curl
       $configureFlags