Licensing for bundling setup-x86[_64].exe installer?

[m.gainer@comcast.net]

I'm working on a Google-sponsored open-source project. I'd like to bundle setup-x86.exe with the project to improve usablility on our installer. The installer fetches Cygwin to enable our bash scripts to install our other dependencies and then launch App Engine runtime/installer tools. 

The question is: What's the license for setup-x86.exe and setup-x86_64.exe itself? 

I see the FAQ and the licensing page, and AFAICT those are discussing the items installed by Cygwin and the Cygwin runtime, rather than _just_ the installer. Running 'strings' on the installer executable doesn't yield anything relevant. 

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