gtk3: change name to gtk+3-3.*, don't lower priority

This is to allow alongside installation of gtk2 and gtk3 in user envs.
Therefore, decreasing the priority of gtk3 was superfluous now.
xorg xcb-util-wm: minor update
xorg xkeyboard-config: update, unify with the other expression
automake-1.10: remove, probably vulnerable CVE-2012-3386

The only user was xorg ATM, which I would remove from anyway.
mesa: revert to 9.2.* until the driver problems are fixed

I was unable to make the gallium drivers not to miss some LLVM RTTI stuff.
9.* don't build with llvm-3.4.
Merge master into x-updates
gtk3: bugfix update 3.10.6 -> .7, fix bad URI

The bad URI was introduced by changing the name in 4881100.
gdk-pixbuf: bugfix update 2.30.2 -> .3, enable tests

Hopefully the tests will succeed on Hydra, too.
harfbuzz: minor update 0.9.25 -> .26
fontconfig: update 2.10.2 -> 2.11.0

Finally. This was blocking pango update for many months.
Hopefully the infinality patches still work with this release.
pango: major update 1.32.5 -> 1.36.1, enable tests

Also propagate stuff in *.pc dependencies.
release: fix automake evaluation, broken in 5888f27c
pango: disable tests (fail to find config in chroot)
Merge master into x-updates

Conflicts (taken master):
	pkgs/development/compilers/llvm/3.4/llvm.nix
fontconfig: propagate freetype as *.pc requires; maintain
spring: disable parallel building, as it breaks on Hydra
Merge master into x-updates
libpng(_apng): maintenance update 1.6.8 -> .9
gdk_pixbuf: bugfix update 2.30.3 -> .4
Merge master into x-updates

Conflicts (trivial):
	pkgs/games/spring/default.nix