[issue18878] Add support of the 'with' statement to sunau.open.

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


Added file: http://bugs.python.org/file31577/sunau_context_manager.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18878>
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