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

[Zachary Ware]

Zachary Ware added the comment:

Here's the patched file for easier review.

----------
Added file: http://bugs.python.org/file32149/patched_pcbuild_readme.txt

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19273>
_______________________________________