[issue8171] bdist_wininst builds wrongly for --plat-name=win-amd64

[Mark Lawrence]

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


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components:  -Distutils2, Windows
nosy: +dstufft
versions: +Python 3.4, Python 3.5 -3rd party, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8171>
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