Merge 'staging' into closure-size

- there were many easy merge conflicts
- cc-wrapper needed nontrivial changes

Many other problems might've been created by interaction of the branches,
but stdenv and a few other packages build fine now.

pkgs/development/libraries/libvorbis/default.nix

@@ -1,14 +1,11 @@
 { stdenv, fetchurl, libogg, pkgconfig }:
 
-let
-  name = "libvorbis-1.3.4";
-in
-stdenv.mkDerivation {
-  inherit name;
+stdenv.mkDerivation rec {
+  name = "libvorbis-1.3.5";
 
   src = fetchurl {
     url = "http://downloads.xiph.org/releases/vorbis/${name}.tar.xz";
-    sha256 = "0wpk87jnhngcl3nc5i39flkycx1sjzilx8jjx4zc4p8r55ylj19g";
+    sha256 = "1lg1n3a6r41492r7in0fpvzc7909mc5ir9z0gd3qh2pz4yalmyal";
   };
 
   outputs = [ "dev" "out" "doc" ];