Merge commit staging+systemd into closure-size

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

pkgs/tools/compression/gzip/default.nix

@@ -12,6 +12,10 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ xz.bin ];
 
+  preConfigure = if stdenv.isCygwin then ''
+    sed -i lib/fpending.h -e 's,include <stdio_ext.h>,,'
+  '' else null;
+
   # In stdenv-linux, prevent a dependency on bootstrap-tools.
   makeFlags = "SHELL=/bin/sh GREP=grep";