[issue4035] Support bytes for os.exec*()

[Daniel Diniz]

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


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components: +Library (Lib)
priority:  -> high
type:  -> feature request
versions: +Python 3.1 -Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4035>
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