[issue18199] Windows: support path longer than 260 bytes using "\\?\" prefix

[Mark Lawrence]

Changes by Mark Lawrence <breamoreboy at yahoo.co.uk>:


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nosy: +steve.dower, zach.ware -brian.curtin
versions: +Python 3.5 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18199>
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