vino: use wrapGAppsHook

Fixes this:

  .vino-server-wr[8931]: Using the 'memory' GSettings backend. \
  Your settings will not be saved or shared with other applications.

Still, the screen sharing settings under "gnome-control-center sharing"
does not seem to be persisted (except the enabling/disabling sharing
flag itself). Making changes and then re-opening gnome-control-center
shows the default screen sharing settings. Sigh.

pkgs/desktops/gnome-3/3.22/core/vino/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, lib, makeWrapper
+{ stdenv, fetchurl, lib, wrapGAppsHook
 , pkgconfig, gnome3, gtk3, glib, intltool, libXtst, libnotify, libsoup
 , telepathySupport ? false, dbus_glib ? null, telepathy_glib ? null
 , libsecret ? null, gnutls ? null, libgcrypt ? null, avahi ? null
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   doCheck = true;
 
   buildInputs = [
-    makeWrapper
+    wrapGAppsHook
     pkgconfig gnome3.defaultIconTheme gtk3 glib intltool libXtst libnotify libsoup
   ] ++ optionals telepathySupport [ dbus_glib telepathy_glib ]
     ++ optional gnomeKeyringSupport libgnome_keyring3
@@ -25,8 +25,7 @@ stdenv.mkDerivation rec {
     ];
 
   preFixup = ''
-    wrapProgram "$out/libexec/vino-server" \
-      --prefix XDG_DATA_DIRS : "$out/share:$out/share/gsettings-schemas/${name}:$XDG_ICON_DIRS:$GSETTINGS_SCHEMAS_PATH"
+    export GSETTINGS_SCHEMAS_PATH="$out/share/gsettings-schemas/${name}:$GSETTINGS_SCHEMAS_PATH"
   '';
 
   meta = with stdenv.lib; {