[issue21907] Update Windows build batch scripts

[Martin v. Löwis]

Martin v. Löwis added the comment:

All fine with me. As for buildmsi.bat: note that we used to have a "daily msi" builder that was using the script. It took too much effort to keep it running.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21907>
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