Merge branch 'quassel'

Add Qt 5 versions of Quassel's client and daemon.

pkgs/top-level/all-packages.nix

···
     tag = "-qt5";
   };
 
+  quasselClient_qt5 = quassel_qt5.override {
+    monolithic = false;
+    client = true;
+    tag = "-client-qt5";
+  };
+
+  quasselDaemon_qt5 = quassel_qt5.override {
+    monolithic = false;
+    daemon = true;
+    tag = "-daemon-qt5";
+  };
+
   quirc = callPackage ../tools/graphics/quirc {};
 
   quodlibet = callPackage ../applications/audio/quodlibet {