[issue10905] zipfile: fix arcname with leading '///' or '..'

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

What happens when the archive contains both 'foo' and '../foo'? They seem to be extracted at the same place.

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nosy: +amaury.forgeotdarc

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10905>
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