[issue19273] Update PCbuild/readme.txt

[Zachary Ware]

Zachary Ware added the comment:

Thanks, Tim!  There are a couple minor things I'd like to get into a new patch before it's committed (there are a couple tabs that should be spaces, and I'd like to add a very short note to the Sub-Projects header about sub-projects being contained in .vcxproj and .vcxproj.filters files).  I'll try to have a new patch up tonight or tomorrow.

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