darwin.DarwinTools: update src

pkgs/os-specific/darwin/DarwinTools/default.nix

···
   version = "1";
 
   src = fetchurl {
-    url = "https://opensource.apple.com/tarballs/DarwinTools/DarwinTools-${version}.tar.gz";
-    sha256 = "0hh4jl590jv3v830p77r3jcrnpndy7p2b8ajai3ldpnx2913jfhp";
+    url = "https://web.archive.org/web/20180408044816/https://opensource.apple.com/tarballs/DarwinTools/DarwinTools-${version}.tar.gz";
+    hash = "sha256-Fzo5QhLd3kZHVFKhJe7xzV6bmRz5nAsG2mNLkAqVBEI=";
   };
 
   patches = [