[issue15496] harden directory removal for tests on Windows

[Jeremy Kloth]

Jeremy Kloth added the comment:

> What are those programs exactly? A buildbot should ideally have a lean system install that does not interfere with the tests running.

My development machine has add'l programs, not the buildbot machine.
Sorry is there was any confusion.  I get the same occasional access
denied errors when running the tests locally.

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<http://bugs.python.org/issue15496>
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