qxt: remove after being marked broken for over two years

It was marked in commit 40ed226507 by Robin Gloster on 2017-09-28 (commited on 2017-09-30)

pkgs/development/libraries/qxt/default.nix

@@ -1,34 +0,0 @@
-{ lib, stdenv, which, coreutils, fetchzip, qt4 }:
-
-stdenv.mkDerivation rec {
-  pname = "qxt";
-  version = "0.6.2";
-
-  src = fetchzip {
-    url = "https://bitbucket.org/libqxt/libqxt/get/v${version}.tar.gz";
-    sha256 = "0zmqfn0h8cpky7wgaaxlfh0l89r9r0isi87587kaicyap7a6kxwz";
-  };
-
-  buildInputs = [ qt4 which ];
-
-  patchPhase = ''
-    patchShebangs configure
-    substituteInPlace configure --replace "/bin/pwd" "${coreutils}/bin/pwd"
-  '';
-
-  prefixKey = "-prefix ";
-
-  meta = {
-    homepage = "http://libqxt.org";
-    description = "An extension library for Qt";
-    longDescription = ''
-      An extension library for Qt providing a suite of cross-platform utility
-      classes to add functionality not readily available in the Qt toolkit by Qt
-      Development Frameworks, Nokia.
-    '';
-    license = lib.licenses.gpl2;
-    platforms = lib.platforms.linux;
-    maintainers = with lib.maintainers; [ forkk ];
-    broken = true;
-  };
-}

pkgs/top-level/all-packages.nix

@@ -19941,8 +19941,6 @@ with pkgs;
     inherit (darwin.apple_sdk.frameworks) AGL;
   };
 
-  qxt = callPackage ../development/libraries/qxt {};
-
   rabbitmq-c = callPackage ../development/libraries/rabbitmq-c {};
 
   raft-canonical = callPackage ../development/libraries/raft-canonical { };