Building racket on Windows

[Reuben Thomas]

I have (mostly successfully) built Racket on Windows 10 by installing VS2013 (the version used in .appveyor.yml) and running the commands from .appveyor.yml.

However, I still have two problems:

1. The build hangs during the generation of documentation.

2. The resultant DrRacket starts up fine and kind of works, but the UI locks up after a few keystrokes or mouse clicks.

This is with current git master head.

(The pre-built Windows release works fine for me.)

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