[issue6731] Non-zero exit status of setup.py when building of extensions has failed

[Martin v. Löwis]

Changes by Martin v. Löwis <martin at v.loewis.de>:


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versions:  -Python 2.4, Python 2.5, Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6731>
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