[issue20571] test_codecs currently failing on several Windows buildbots

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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components: +Unicode, Windows
nosy: +doerwalter, lemburg, serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20571>
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