[issue29094] Regression in zipfile writing in 2.7.13

[Serhiy Storchaka]

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


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stage: commit review -> backport needed
versions:  -Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29094>
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