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

[Zachary Ware]

Zachary Ware added the comment:

Here's the new patch, a few tabs converted, a few trailing spaces removed, and one sentence added to the Sub-projects section description.

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Added file: http://bugs.python.org/file32336/pcbuild_readme.v2.diff

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