[issue30450] Pull Windows dependencies from GitHub rather than svn.python.org

[Steve Dower]

Steve Dower added the comment:

The buildbot failures currently being blamed on issue30916 are actually due to this issue - we actually need Python 3.6 on these machines in order to download the new externals, and they don't have it and we can't get it via Powershell.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30450>
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