[issue17679] sysconfig generation uses some env variables multiple times

[Serhiy Storchaka]

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


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stage: needs patch -> patch review
versions: +Python 3.5 -Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17679>
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