python site.py that loads pth files anywhere on PYTHONPATH

This file is normally created by easy_install / distutils, but removed
and packaged separately to avoid collisions and allow for more use cases.

svn path=/nixpkgs/branches/stdenv-updates/; revision=32579

pkgs/top-level/python-packages.nix

@@ -19,6 +19,12 @@ let pythonPackages = python.modules // rec {
   };
 
 
+  site = import ../development/python-modules/site {
+    inherit (pkgs) stdenv;
+    inherit python;
+  };
+
+
   ipython = import ../shells/ipython {
     inherit (pkgs) stdenv fetchurl;
     inherit buildPythonPackage pythonPackages;