[issue30730] Injecting environment variable in subprocess on Windows

[Serhiy Storchaka]

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


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nosy: +georg.brandl
stage: patch review -> backport needed
versions: +Python 3.3, Python 3.4 -Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30730>
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