virt-manager: update to 1.0.1, fix & update dependencies, gtk3 support

- Vte, add gtk3 support, enable introspection, update to 0.35.90
- Spice-gtk, add gtk3 support
- gtk-vnc, add gtk3 support
- Add libvirt-glib (thanks @bjornfor)
- Add usbredir
- qemu, enable usbredir
- spice-gtk, enable usbredir
- virt-manager, update to 1.0.1

[Bjørn:
* Set namePrefix = "" to preserve package name "virt-manager"
  (instead of "python2.7-virt-manager")
* Add dconf to GIO_EXTRA_MODULES to get persistent settings in
  virt-manager. Without it:
  GLib-GIO-Message: Using the 'memory' GSettings backend. Your settings will not be saved or shared with other applications.
* Add ${gtk3}/share to XDG_DATA_DIRS to unbreak "Take Screenshot"
  feature (fixes "Settings schema 'org.gtk.Settings.FileChooser' is not installed")
* gtk-vnc: don't pull "pkgs" attrset for optionalString, use stdenv.lib.optionalString instead.
]

pkgs/tools/admin/gtk-vnc/default.nix

@@ -1,8 +1,8 @@
-{ stdenv, fetchurl
+{ stdenv, fetchurl, gobjectIntrospection
 , python, gtk, pygtk, gnutls, cairo, libtool, glib, pkgconfig, libtasn1
 , libffi, cyrus_sasl, intltool, perl, perlPackages, firefoxPkgs, pulseaudio
-, kbproto, libX11, libXext, xextproto, pygobject, libgcrypt }:
-
+, kbproto, libX11, libXext, xextproto, pygobject, libgcrypt, gtk3, vala
+, pygobject3, enableGTK3 ? false }:
 
 stdenv.mkDerivation rec {
   name = "gtk-vnc-${version}";
@@ -14,21 +14,24 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [
-    python gtk pygtk gnutls cairo libtool pkgconfig glib libffi libgcrypt
-    intltool cyrus_sasl pulseaudio pygobject perl perlPackages.TextCSV
-  ];
+    python gnutls cairo libtool pkgconfig glib libffi libgcrypt
+    intltool cyrus_sasl pulseaudio perl perlPackages.TextCSV
+    gobjectIntrospection
+  ] ++ (if enableGTK3 then [ gtk3 vala pygobject3 ] else [ gtk pygtk pygobject ]);
 
   NIX_CFLAGS_COMPILE = "-fstack-protector-all";
   configureFlags = [
     "--with-python"
     "--with-examples"
+    (if enableGTK3 then "--with-gtk=3.0" else "--with-gtk=2.0")
   ];
 
-  makeFlags = "CODEGENDIR=${pygobject}/share/pygobject/2.0/codegen/ DEFSDIR=${pygtk}/share/pygtk/2.0/defs/";
+  makeFlags = stdenv.lib.optionalString (!enableGTK3)
+    "CODEGENDIR=${pygobject}/share/pygobject/2.0/codegen/ DEFSDIR=${pygtk}/share/pygtk/2.0/defs/";
 
   meta = with stdenv.lib; {
     description = "A GTK VNC widget";
-    maintainers = with maintainers; [ raskin ];
+    maintainers = with maintainers; [ raskin offline ];
     platforms = platforms.linux;
     license = licenses.lgpl21;
   };