[issue4905] Use INVALID_FILE_ATTRIBUTES instead of magic numbers

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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components: +Extension Modules, Windows -Interpreter Core
nosy: +brian.curtin, tim.golden
stage:  -> patch review
versions: +Python 3.2 -Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4905>
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