[issue21907] Update Windows build batch scripts

[Ingolf Becker]

Ingolf Becker added the comment:

This should now be the correct way.
I did not need to touch build.bat indeed. I got confused by all the different combinations! I have removed the calls from build_pgo.bat to build.bat and changed the it to a native x64 build - the PGO requires the code to be run natively, so cross compiling makes no sense.
There was also one \ too many in the pginstrument.props file, which caused a path to end on a \\, which broke the build process.

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Added file: http://bugs.python.org/file35986/fix_pgo_vcvarsall_rightway.diff

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