[issue11591] "python -S" should be robust against e.g. "from site import addsitedir"

[Carl Meyer]

Changes by Carl Meyer <carl at dirtcircle.com>:


Added file: http://bugs.python.org/file21327/ebe5760afa08.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11591>
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