[issue17896] Move Windows external libs from <src>\..\ to <src>\externals

[Zachary Ware]

Zachary Ware added the comment:

I'm ambivalent on per-version externals dirs by now; I've since found it much easier to maintain hg-shared repos per branch.  I'll go ahead with this shortly on all three branches, unless there are objections to it on 2.7 and 3.4.

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versions: +Python 2.7, Python 3.4

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<http://bugs.python.org/issue17896>
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