kde4: Get rid of some Nepomuk cruft by default

(cherry picked from commit 020e88704a)

nixos/modules/services/x11/desktop-managers/kde4.nix

@@ -14,7 +14,7 @@ let
   # files), segfault sometimes and consume significant resources.
   # They can be re-enabled in the KDE System Settings under "Desktop
   # Search".
-  nepomukConfig = pkgs.writeTextFile
+  disableNepomuk = pkgs.writeTextFile
     { name = "nepomuk-config";
       destination = "/share/config/nepomukserverrc";
       text =
@@ -76,6 +76,12 @@ in
         default = true;
         description = "Whether to enable PIM support. Note that enabling this pulls in Akonadi and MariaDB as dependencies.";
       };
+
+      enableNepomuk = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to enable Nepomuk (deprecated).";
+      };
     };
   };
 
@@ -144,7 +150,6 @@ in
 
           pkgs.kde4.kde_wallpapers # contains kdm's default background
           pkgs.kde4.oxygen_icons
-          pkgs.virtuoso # to enable Nepomuk to find Virtuoso
 
           # Starts KDE's Polkit authentication agent.
           pkgs.kde4.polkit_kde_agent
@@ -155,18 +160,22 @@ in
           xorg.xmessage # so that startkde can show error messages
           xorg.xset # used by startkde, non-essential
           xorg.xauth # used by kdesu
-          pkgs.shared_desktop_ontologies # used by nepomuk
-          pkgs.strigi # used by nepomuk
         ]
       ++ optionals cfg.enablePIM
         [ pkgs.kde4.kdepim_runtime
           pkgs.kde4.akonadi
           pkgs.mysql # used by akonadi
         ]
+      ++ (if cfg.enableNepomuk then
+        [ pkgs.shared_desktop_ontologies # used by nepomuk
+          pkgs.strigi # used by nepomuk
+          pkgs.virtuoso # to enable Nepomuk to find Virtuoso
+        ] else
+        [ disableNepomuk ])
       ++ optional config.hardware.pulseaudio.enable pkgs.kde4.kmix  # Perhaps this should always be enabled
       ++ optional config.hardware.bluetooth.enable pkgs.kde4.bluedevil
       ++ optional config.networking.networkmanager.enable pkgs.kde4.plasma-nm
-      ++ [ nepomukConfig ] ++ phononBackendPackages;
+      ++ phononBackendPackages;
 
     environment.pathsToLink = [ "/share" ];