Merge commit staging+systemd into closure-size

Many non-conflict problems weren't (fully) resolved in this commit yet.

pkgs/development/libraries/libpng/12.nix

@@ -1,19 +1,17 @@
-{ stdenv, fetchurl, zlib, xz }:
+{ stdenv, fetchurl, zlib }:
 
 assert !(stdenv ? cross) -> zlib != null;
 
 stdenv.mkDerivation rec {
-  name = "libpng-1.2.51";
+  name = "libpng-1.2.53";
 
   src = fetchurl {
     url = "mirror://sourceforge/libpng/${name}.tar.xz";
-    sha256 = "0jkdlmnvn72jwm94dp98pznm9fy7alvcr2zpfh2dgbr2n09vimy7";
+    sha256 = "02jwfqk1ahqfvbs9gdyb5v0123by9ws6m7jnfvainig7i7v4jpml";
   };
 
   propagatedBuildInputs = [ zlib ];
 
-  nativeBuildInputs = [ xz ];
-
   passthru = { inherit zlib; };
 
   crossAttrs = stdenv.lib.optionalAttrs (stdenv.cross.libc == "libSystem") {

pkgs/development/libraries/libpng/15.nix

@@ -1,26 +0,0 @@
-{ stdenv, fetchurl, zlib }:
-
-assert zlib != null;
-
-stdenv.mkDerivation rec {
-  name = "libpng-1.5.19";
-
-  src = fetchurl {
-    url = "mirror://sourceforge/libpng/${name}.tar.xz";
-    sha256 = "1s990cdsdlbb78aq4sj2vq2849p2nbbbnbk5p8f9w45rn0v5q98y";
-  };
-
-  propagatedBuildInputs = [ zlib ];
-
-  doCheck = true;
-
-  passthru = { inherit zlib; };
-
-  meta = {
-    description = "The official reference implementation for the PNG file format";
-    homepage = http://www.libpng.org/pub/png/libpng.html;
-    license = stdenv.lib.licenses.libpng;
-    maintainers = with stdenv.lib.maintainers; [ fuuzetsu ];
-    branch = "1.5";
-  };
-}

pkgs/development/libraries/libpng/default.nix

@@ -1,13 +1,13 @@
-{ stdenv, fetchurl, zlib, apngSupport ? false }:
+{ stdenv, fetchurl, zlib, apngSupport ? true }:
 
 assert zlib != null;
 
 let
-  version = "1.6.16";
-  sha256 = "0q5ygy15jkpqbj5701ywrjzqp4nl5yz3r4g58h2p0kiycggm9xs2";
+  version = "1.6.18";
+  sha256 = "0qq96rf31483kxz32h6l6921hy6p2v2pfqfvc74km229g4xw241f";
   patch_src = fetchurl {
     url = "mirror://sourceforge/libpng-apng/libpng-${version}-apng.patch.gz";
-    sha256 = "1sf27a5gvwvcm4wsf2pyq87d3g4l2fym8cirq9sli54bi753ikbh";
+    sha256 = "0g2ljh2vhclas1hacys1c4gk6l6hyy6sngb2yvdsnjz50nyq16kv";
   };
   whenPatched = stdenv.lib.optionalString apngSupport;