Here's a patch to address the posix failures:

- test_posixpath seems to have lost the creation of one test file.
- WindowsError doesn't exist on other platforms, so it can't be caught directly (in tarfile.py). I've written a work-around, but I don't particularly like it (catches all exceptions and tests the name).

There were three other tests that reported BAD for me.

test_os and test_subprocess were reporting bad due to skipped tests. I presume this will not break the buildbots?

test_readline is failing on readline.clear_history because it appears that attribute doesn't exist. I suspect this error is not related to the symlink patch.