[issue31623] Allow to build MSI installer from the official tarball

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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components: +Windows
nosy: +paul.moore, steve.dower, tim.golden, zach.ware

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31623>
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