[GR-9142] revert tempfile patch

PullRequest: graalpython/295

Author: cosminbasca

graalpython/lib-python/3/test/support/__init__.py

@@ -28,8 +28,7 @@
 # import subprocess
 import sys
 import sysconfig
-# TODO: Truffle reenable me once supported (GR-9142)
-# import tempfile
+import tempfile
 import time
 import types
 import unittest