[issue21907] Update Windows build batch scripts

[Zachary Ware]

Zachary Ware added the comment:

As you can probably tell, I wasn't on a machine where I could test build_pgo.bat before I committed changes to it (oops).

It looks like your patch is reversed, would you mind fixing it?  I can tell you it will need to change, though; build.bat needs to use 'x86_amd64' for the argument to vcvarsall.bat for building 64-bit to support cross-compiling on 32-bit Windows.  It may work out easiest for build_pgo.bat to just not use build.bat.

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<http://bugs.python.org/issue21907>
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