[clang] [Clang] [Driver] add a Cygwin ToolChain (PR #135691)

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jeremyd2019 wrote:

I'm fighting the tests on Windows - the hurd test I started from had `// UNSUPPORTED: system-windows` at the top, probably because they weren't interested in messing around with backslashes and .exe extensions.  I don't know if the cross test will work right for the path to the cross as, is there some way to annotate just one test in the file as unsupported on Windows?

https://github.com/llvm/llvm-project/pull/135691