[docs] [issue19273] Update PCbuild/readme.txt

[Tim Golden]

Tim Golden added the comment:

Thanks, Zachary. Do you see this going against just tip, or should it be 
backported to 3.3 / 2.7? (I'm not sure how well the latter would be 
received, truth be told).

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<http://bugs.python.org/issue19273>
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