Merge master into stdenv-updates

Conflicts (simple):
	pkgs/development/compilers/gcc/4.8/default.nix
	pkgs/development/compilers/llvm/default.nix
	pkgs/development/libraries/gmp/5.1.1.nix
	pkgs/development/libraries/gmp/5.1.3.nix
	pkgs/development/libraries/gmp/5.1.x.nix
	pkgs/top-level/all-packages.nix

pkgs/tools/compression/lzip/default.nix

@@ -1,13 +1,13 @@
 { stdenv, fetchurl, texinfo }:
 
 stdenv.mkDerivation rec {
-  name = "lzip-1.14";
+  name = "lzip-1.15";
 
   buildInputs = [ texinfo ];
 
   src = fetchurl {
     url = "mirror://savannah/lzip/${name}.tar.gz";
-    sha256 = "1rybhk2pxpfh2789ck9mrkdv3bpx7b7miwndlshb5vb02m9crxbz";
+    sha256 = "1dh5vmj5apizfawnsm50y7z064yx7cz3313przph16gwd3dgrlvw";
   };
 
   configureFlags = "CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3";

pkgs/tools/compression/pigz/default.nix

@@ -1,14 +1,14 @@
 { stdenv, fetchurl, zlib, utillinux }:
 
 let name = "pigz";
-    version = "2.2.4";
+    version = "2.3.1";
 in
 stdenv.mkDerivation {
   name = name + "-" + version;
 
   src = fetchurl {
     url = "http://www.zlib.net/${name}/${name}-${version}.tar.gz";
-    sha256 = "7e7967c47f66c07be97cbfa25c8816b72f9d35258466ea31eddc7666c914160e";
+    sha256 = "0m5gw134wfqy1wwqzla0f6c88bxys1sq5gs22zrphf9a8bjhr6v2";
   };
 
   buildInputs = [zlib] ++ stdenv.lib.optional stdenv.isLinux utillinux;
@@ -28,7 +28,7 @@ stdenv.mkDerivation {
     homepage = "http://www.zlib.net/pigz/";
     description = "A parallel implementation of gzip for multi-core machines";
 
-    platforms = stdenv.lib.platforms.unix;
+    hydraPlatforms = stdenv.lib.platforms.linux;
     maintainers = [ stdenv.lib.maintainers.simons ];
   };
 }