[docs] [issue19391] Fix PCbuild/readme.txt in 2.7 and 3.3

[Zachary Ware]

Changes by Zachary Ware <zachary.ware at gmail.com>:


Added file: http://bugs.python.org/file32470/pcbuild_readme-3.3.diff

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<http://bugs.python.org/issue19391>
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