[issue21907] Update Windows build batch scripts

[Ingolf Becker]

Ingolf Becker added the comment:

A couple of issues: 
PCbuild/build_pgo.bat: 
- there a quite a few incorrect "" which break the call to rmpyc.py
- some paths were not cwd-agnostic
- all paths should now be whitespace aware
- The PGI python.exe requires the pgodb100.dll to be in the PATH when executed. vcvarsall.bat sets the path correctly.

PCbuild/build_pgo.bat:
- incorrect parameter for vcvarsall.bat for x64: x86_amd64 == x86!!

With these changes build_pgo.bat works.

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nosy: +ibecker
Added file: http://bugs.python.org/file35985/fix_pgo_vcvarsall.diff

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