[issue16715] Get rid of IOError. Use OSError instead

[koobs]

koobs added the comment:

Commit to 3.3 broke at least my FreeBSD buildbot:

http://buildbot.python.org/all/builders/AMD64%20FreeBSD%209.0%20dtrace%203.3/builds/641/steps/test/logs/stdio

Also setting +Version: Python 3.3 on this.

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nosy: +koobs
versions: +Python 3.3

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