[issue19962] Create a 'python.bat' script to invoke interpreter from source root

[Zachary Ware]

Zachary Ware added the comment:

This appears to work correctly for PGO builds and x64 builds.  Does anyone have any objections to this, or suggestions for improvement?

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versions: +Python 3.5 -Python 3.4

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<http://bugs.python.org/issue19962>
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