herqq: mark broken

- build fails with qt511 and qt59
  (it used to build with qt510 which is not available anymore)
- no nixpkgs maintainer
- upstream repo looks inactive, last commit a year ago

pkgs/development/libraries/herqq/default.nix

@@ -20,5 +20,6 @@ stdenv.mkDerivation rec {
     description = "A software library for building UPnP devices and control points";
     platforms = platforms.linux;
     maintainers = [ ];
+    broken = true; # 2018-09-21, built with qt510 (which was removed) but neither qt59 nor qt511
   };
 }