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

[Zachary Ware]

Zachary Ware added the comment:

After the most recent changes to the buildbot scripts, it would be every time without a patch to the clean script, but at the time I only meant a single time (which really isn't a big deal).

The patch is well out of date, I can update it if we can come to a consensus that this kind of change is a good idea.

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stage:  -> patch review
versions: +Python 3.5 -Python 3.4

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