bitcoin-gold: remove

Motivations:

1. Bitcoin Gold has been unmmaintained since 2020
2. The GUI wallet doesn't support Qt > 5.14, which is deprecated

pkgs/applications/blockchains/bitcoin-gold/default.nix

@@ -1,72 +0,0 @@
-{ lib, stdenv
-, fetchFromGitHub
-, openssl
-, boost
-, libb2
-, libevent
-, autoreconfHook
-, db4
-, pkg-config
-, protobuf
-, hexdump
-, zeromq
-, libsodium
-, withGui
-, qtbase ? null
-, qttools ? null
-, wrapQtAppsHook ? null
-}:
-
-with lib;
-
-stdenv.mkDerivation rec {
-
-  pname = "bitcoin" + toString (optional (!withGui) "d") + "-gold";
-  version = "0.17.3";
-
-  src = fetchFromGitHub {
-    owner = "BTCGPU";
-    repo = "BTCGPU";
-    rev = "v${version}";
-    sha256 = "sha256-1tFoUNsCPJkHSmNRl5gE3n2EQD6RZSry1zIM5hiTzEI=";
-  };
-
-  nativeBuildInputs = [
-    autoreconfHook
-    pkg-config
-    hexdump
-  ] ++ optionals withGui [
-    wrapQtAppsHook
-  ];
-
-  buildInputs = [
-    openssl
-    boost
-    libevent
-    db4
-    zeromq
-    libsodium
-    libb2
-  ] ++ optionals withGui [
-    qtbase
-    qttools
-    protobuf
-  ];
-
-  enableParallelBuilding = true;
-
-  configureFlags = [
-      "--with-boost-libdir=${boost.out}/lib"
-  ] ++ optionals withGui [
-      "--with-gui=qt5"
-      "--with-qt-bindir=${qtbase.dev}/bin:${qttools.dev}/bin"
-  ];
-
-  meta = {
-    description = "BTG is a cryptocurrency with Bitcoin fundamentals, mined on common GPUs instead of specialty ASICs";
-    homepage = "https://bitcoingold.org/";
-    license = licenses.mit;
-    maintainers = [ maintainers.mmahut ];
-    platforms = platforms.linux;
-  };
-}

pkgs/top-level/aliases.nix

@@ -134,6 +134,8 @@ mapAliases ({
   bitbucket-cli = throw "bitbucket-cli has been removed: abandoned by upstream"; # Added 2022-03-21
   bitcoin-classic = throw "bitcoin-classic has been removed: the Bitcoin Classic project has closed down, https://bitcoinclassic.com/news/closing.html"; # Added 2022-11-24
   bitcoind-classic = throw "bitcoind-classic has been removed: the Bitcoin Classic project has closed down, https://bitcoinclassic.com/news/closing.html"; # Added 2022-11-24
+  bitcoin-gold = throw "bitcoin-gold has been removed since it's unnmaintained and will stop building with Qt > 5.14"; # Added 2022-11-24
+  bitcoind-gold = throw "bitcoin-gold has been removed since it's unnmaintained: https://github.com/BTCGPU/BTCGPU/graphs/code-frequency"; # Added 2022-11-24
   bitsnbots = throw "bitsnbots has been removed because it was broken and upstream missing"; # Added 2021-08-22
   blastem = throw "blastem has been removed from nixpkgs as it would still require python2"; # Added 2022-01-01
   bluezFull = bluez; # Added 2019-12-03

pkgs/top-level/all-packages.nix

@@ -33555,15 +33555,6 @@ with pkgs;
     withGui = false;
   };
 
-  bitcoin-gold = libsForQt514.callPackage ../applications/blockchains/bitcoin-gold {
-    boost = boost165;
-    withGui = true;
-  };
-  bitcoind-gold = callPackage ../applications/blockchains/bitcoin-gold {
-    boost = boost165;
-    withGui = false;
-  };
-
   btcpayserver = callPackage ../applications/blockchains/btcpayserver { };
 
   charge-lnd = callPackage ../applications/blockchains/charge-lnd { };