[issue20517] Support errors with two filenames for errno exceptions

[Larry Hastings]

Larry Hastings added the comment:

Added a test checking that the error messages show up properly.

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assignee:  -> larry
stage: needs patch -> patch review
Added file: http://bugs.python.org/file34005/larry.oserror.add.filename2.2.diff

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<http://bugs.python.org/issue20517>
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