[issue1298835] Add a vendor-packages directory for system-supplied modules

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1298835>
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