[issue7443] test.support.unlink issue on Windows platform

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

FWIW, Mercurial uses the following dance:
http://selenic.com/repo/hg/file/463aca32a937/mercurial/windows.py#l296

(Mercurial is under the GPL, so we can't copy that code verbatim; but it can serve as an inspiration)

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nosy: +pitrou

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