Revert "Merge pull request #9543 from NixOS/staging.post-15.06"

This reverts commit f61176c539, reversing
changes made to a27ca029ee.

Conflicts:
	pkgs/development/libraries/ncurses/default.nix

pkgs/os-specific/linux/systemd/default.nix

@@ -3,7 +3,6 @@
 , glib, kbd, libxslt, coreutils, libgcrypt
 , kexectools, libmicrohttpd, linuxHeaders
 , pythonPackages ? null, pythonSupport ? false
-, enableKDbus ? false
 }:
 
 assert stdenv.isLinux;
@@ -61,7 +60,7 @@ stdenv.mkDerivation rec {
       "--with-sysvinit-path="
       "--with-sysvrcnd-path="
       "--with-rc-local-script-path-stop=/etc/halt.local"
-    ] ++ stdenv.lib.optional enableKDbus "--enable-kdbus";
+    ];
 
   preConfigure =
     ''