[issue4738] Patch to make zlib-objects better support threads

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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nosy: +pitrou
priority:  -> normal
stage:  -> patch review
versions:  -Python 2.5, Python 2.6, Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4738>
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