python: pip: missing setuptools dependency

pip commands that deal with source distributions require setuptools.
This change unbreaks those commands.

pkgs/development/python-modules/pip/default.nix

@@ -26,6 +26,7 @@ buildPythonPackage rec {
   };
 
   nativeBuildInputs = [ bootstrapped-pip ];
+  propagatedBuildInputs = [ setuptools ];
 
   # pip detects that we already have bootstrapped_pip "installed", so we need
   # to force it a little.