[issue11122] bdist_rpm should use rpmbuild, not rpm

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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nosy: +bhyde, ned.deily
versions:  -Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue11122>
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