Merge pull request #22086 from timbertson/pip-stderr

buildPythonPackage: send pip output to stderr

pkgs/development/interpreters/python/build-python-package-setuptools.nix

@@ -49,7 +49,7 @@ in attrs // {
       export PATH="$tmp_path/bin:$PATH"
       export PYTHONPATH="$tmp_path/${python.sitePackages}:$PYTHONPATH"
       mkdir -p $tmp_path/${python.sitePackages}
-      ${bootstrapped-pip}/bin/pip install -e . --prefix $tmp_path
+      ${bootstrapped-pip}/bin/pip install -e . --prefix $tmp_path >&2
     fi
     ${postShellHook}
   '';