Add PACK definitions for Windows
Add PACK definitions for Windows

Summary:
This adds the definitions for how to split up Windows releases.
This only works with the previous change because otherwise
the Flipper.exe will change with every release build number.

Reviewed By: mweststrate

Differential Revision: D25977814

fbshipit-source-id: 4fb9d4e9562dedf43f9e9ec90a49801f60ed4550

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