[issue31340] Use VS 2017 compiler for build

[INADA Naoki]

INADA Naoki added the comment:

Nice! VS2017 is much lighter than VS2015 for install size!
https://blogs.msdn.microsoft.com/vcblog/2016/08/22/the-lightweight-visual-studio-15-installer/

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nosy: +inada.naoki

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31340>
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