packaging: don't use temporary directory

We were no longer doing anything with it after extracting
virtualenv and py2exe to the build directory.

Differential Revision: https://phab.mercurial-scm.org/D6089

contrib/packaging/hgpackaging/inno.py

@@ -11,7 +11,6 import os
 import pathlib
 import shutil
 import subprocess
-import tempfile
 
 from .downloads import (
     download_entry,
@@ -99,9 +98,6 def build(source_dir: pathlib.Path, buil
     if not py2exe_source_path.exists():
         extract_zip_to_directory(py2exe_pkg, build_dir)
 
-    with tempfile.TemporaryDirectory() as td:
-        td = pathlib.Path(td)
-
         if not venv_path.exists():
             print('creating virtualenv with dependencies')
             subprocess.run(