systemd: Update to 212

Note that systemd no longer depends on dbus, so we're rid of the
cyclic dependency problem between systemd and dbus.

This commit incorporates from wkennington's systemd branch
(203dcff45002a63f6be75c65f1017021318cc839,
1f842558a95947261ece66f707bfa24faf5a9d88).

pkgs/development/libraries/dbus/default.nix

@@ -67,14 +67,12 @@ let
 
   } merge ]);
 
-  libs = dbus_drv "libs" "dbus" ({
+  libs = dbus_drv "libs" "dbus" {
     # Enable X11 autolaunch support in libdbus. This doesn't actually depend on X11
     # (it just execs dbus-launch in dbus.tools), contrary to what the configure script demands.
     NIX_CFLAGS_COMPILE = "-DDBUS_ENABLE_X11_AUTOLAUNCH=1";
-  } // stdenv.lib.optionalAttrs (systemdOrEmpty != []) {
-    buildInputs = [ systemd.headers ];
-    patches = [ ./systemd.patch ]; # bypass systemd detection
-  });
+    buildInputs = [ systemdOrEmpty ];
+  };
 
 
   attrs = rec {
@@ -83,14 +81,13 @@ let
   # This package has been split because most applications only need dbus.lib
   # which serves as an interface to a *system-wide* daemon,
   # see e.g. http://en.wikipedia.org/wiki/D-Bus#Architecture .
-  # Also some circular dependencies get split by this (like with systemd).
 
   inherit libs;
 
   tools = dbus_drv "tools" "tools" {
     configureFlags = [ "--with-dbus-daemondir=${daemon}/bin" ];
-    buildInputs = buildInputsX ++ systemdOrEmpty ++ [ libs daemon dbus_glib ];
-    NIX_CFLAGS_LINK = 
+    buildInputs = buildInputsX ++ systemdOrEmpty ++ [ libs daemon ];
+    NIX_CFLAGS_LINK =
       stdenv.lib.optionalString (!stdenv.isDarwin) "-Wl,--as-needed "
       + "-ldbus-1";
 
@@ -102,16 +99,6 @@ let
     buildInputs = systemdOrEmpty;
   };
 
-  # Some of the tests don't work yet; in fact, @vcunat tried several packages
-  # containing dbus testing, and all of them have some test failure.
-  tests = dbus_drv "tests" "test" {
-    preBuild = makeInternalLib;
-    buildInputs = buildInputsX ++ systemdOrEmpty ++ [ libs tools daemon dbus_glib python ];
-    NIX_CFLAGS_LINK = 
-      stdenv.lib.optionalString (!stdenv.isDarwin) "-Wl,--as-needed "
-      + "-ldbus-1";
-  };
-
   docs = dbus_drv "docs" "doc" {
     postInstall = ''rm -r "$out/lib"'';
   };