[issue22919] Update PCBuild for VS 2015

[Zachary Ware]

Zachary Ware added the comment:

Another round of review posted on Rietveld.  I'll try to get the VS2015 preview downloaded today and give some more feedback after using it.

Just one inconsequential note on python3.diff: the 'lib' command in python3dll.vcxproj could use a '/nologo' flag.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22919>
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