Remove unused import statements in setup.py

This should fix the following warning:

UserWarning: Distutils was imported before Setuptools. This usage is
discouraged and may exhibit undesirable behaviors or errors. Please
use Setuptools’ objects directly or at least import Setuptools first.

Author: ctrl-z-9000-times

setup.py

@@ -21,8 +21,6 @@
 import os
 import subprocess
 import sys
-import tempfile
-import distutils.dir_util
 import json
 
 from setuptools import Command, find_packages, setup