Revert "Fix tmpfile cleanup for windows (itertools not supported), Fix #6209"

This reverts commit 03561b784003035e4b9d11e95a9e508460440b04.
Import itertools in win_file.py
Fix PEP8 stuff
Merge pull request #6217 from basepi/tmpfiles

Revert "fix" for windows itertools.  Just import itertools in win_file.py instead.