[issue21907] Update Windows build batch scripts

[David Bolen]

David Bolen added the comment:

I'm seeing an apparent side-effect of the new clean script (or it seems to correlate).  Since it started running, the Windows buildbots (both 7 and XP) seem to always perform a full clone of the master repository for each build rather than just a pull/update.  That's a noticeable performance difference (15-20 minutes per clone rather than the more typical 1-2 minutes for pull/update) and seems like it should be unnecessary.

I'm not quite sure how the buildbot task makes the decision between the two approaches, but could the new clean be removing a file that's relevant to how the decision is made?

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