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

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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type:  -> feature request
versions: +Python 3.3 -Python 3.2

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