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

[Terry J. Reedy]

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


Added file: http://bugs.python.org/file21350/ebe5760afa08.diff

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