Update skarnet.org software for 2.0 release.

New build system using configure script and GNU Make 4.0, and new
releases of the following using the new build system:

execline 2.0.0.0
s6 2.0.0.0
s6-dns 2.0.0.0
s6-linux-utils 2.0.0.0
s6-networking 2.0.0.0
s6-portable-utils 2.0.0.0
skalibs 2.0.0.0

pkgs/development/tools/build-managers/skarnet/default.nix

@@ -1,21 +0,0 @@
-{ stdenv }:
-
-let
-
-  version = "2014-11-28";
-
-in stdenv.mkDerivation {
-
-  name = "skarnet-conf-compile-${version}";
-
-  phases = [ "fixupPhase" ];
-
-  setupHook = ./setup-hook.sh;
-
-  meta = {
-    homepage = http://www.skarnet.org/software/conf-compile.html;
-    description = "Support for configuring skarnet.org packages for nix builds";
-    platforms = stdenv.lib.platforms.all;
-  };
-
-}

pkgs/development/tools/build-managers/skarnet/setup-hook.sh

@@ -1,47 +0,0 @@
-# Packages from skarnet.org use a unique build system. These functions
-# assist with some common configuration and shebang patching.
-
-skarnetConfigure() {
-  runHook preConfigure
-
-  pushd conf-compile >/dev/null
-
-  # paths
-  > conf-defaultpath         printf "$out/bin"
-  > conf-etc                 printf "$out/etc"
-  > conf-install-command     printf "$out/bin"
-  > conf-install-include     printf "$out/include"
-  > conf-install-libexec     printf "$out/libexec"
-  > conf-install-library     printf "$out/lib"
-  > conf-install-library.so  printf "$out/lib"
-  > conf-install-sysdeps     printf "$out/sysdeps"
-
-  # use generic 'cc' to support both gcc and clang (darwin) stdenvs
-  for file in conf-cc conf-dynld conf-ld; do
-    substituteInPlace $file --replace gcc cc
-  done
-
-  # let nix builder strip things, cross-platform
-  truncate --size 0 conf-stripbins conf-striplibs
-
-  rm -f flag-slashpackage
-  touch flag-allstatic
-  touch flag-forcedevr          # only used for skalibs
-
-  # build inputs
-  truncate --size 0 import path-include path-library
-  for input in $nativeBuildInputs; do
-    [[ -a "$input/sysdeps" ]] && >> import       printf "$input/sysdeps"
-    [[ -a "$input/include" ]] && >> path-include printf "$input/include"
-    [[ -a "$input/lib" ]]     && >> path-library printf "$input/lib"
-  done
-
-  popd >/dev/null
-
-  # patch various scripts to use stdenv shell
-  patchShebangs src/sys
-
-  runHook postConfigure
-}
-
-export configurePhase=skarnetConfigure