[issue730473] Add Py_AtInit() startup hook for extenders

[Daniel Diniz]

Changes by Daniel Diniz <ajaksu at gmail.com>:


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stage:  -> test needed
versions: +Python 2.7, Python 3.2 -Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue730473>
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