[issue4629] getopt should not accept no_argument that ends with '='

[Mark Lawrence]

Changes by Mark Lawrence <breamoreboy at yahoo.co.uk>:


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stage:  -> commit review
versions: +Python 3.2 -Python 2.6, Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4629>
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