mesa: update 9.1.6 -> 9.2.1, enable R600 LLVM stuff
update gtk deps, on GNOME-3.10 branches now
gtk2: minor update .20 -> .21
update wayland deps needed for gtk+ 3.10
gtk3: update 3.8.4 -> 3.10.0
polkit: update, including non-critical CVE-2013-4288 fix
xorg server: major update 1.13.4 -> 1.14.3

- The 1.13 branch gets no updates since April,
  so I thought it's a good time to switch.
- Some xorg modules needed to be updated to build,
  but some don't have the update (probably all very obscure).
- Maybe it would be good to update the intel driver (or some others),
  I don't know.
polkit: remove hacks, fix chroot builds
Merge branch 'master' into x-updates
gtk2: minor update .20 -> .22
mesa: bugfix update 9.1.6 -> .7

Thist is just for master before the official release,
x-updates has 9.2.* already.
gnome-autogen.sh: make check_m4macros aware of ACLOCAL_PATH
new systemd can't inhibit lid switches

Conflicts (repos merge):
	modules/services/x11/display-managers/default.nix
Merge #1082: Update QtCreator to 2.8.1, add Qt 5.1.1 and QtSDK
polkit WIP: TESTED OK, only missing NM config testing/tweaking

History: 7a29bd02 7cd5ff085
polkit WIP: resurrect the forgotten polkituser

It needs no group anymore. I hope it won't clash with leftovers from
previous usage of the user.
polkit WIP: enable forgotten config for NetworkManager

and only authorize "active" sessions.
dbus: minor update 1.6.14 -> .16 "fortify agility"
mesa: add GLES 1 and 2 support by default

The libs have just a few kilobytes and no additional deps.
mesa: bugfix update 9.2.1 -> .2

On 9.2.* we seem to be hitting a [problem] on Hydra
(unlikely to be fixed by this update),
although the tests run fine on my machine.

[problem] https://bugs.freedesktop.org/show_bug.cgi?id=67672