kill borken code for _WIN32

kill borken code for _WIN32

- This code was supposed to retrieve the current directory on Windows
  to pre-seed the path in which we search for trace files (and used to
  search for include files too)
- But it is borken: instead of returning the current dir, it only
  returned the current drive. So the path was not seeded with a useful
  value.
- Plus, now that wubuntu is working correctly, we will soon kill all
  _WIN32 specific stuff.