Aargh! Windows build is broken AGAIN

[Simon Peyton Jones]

I really wish I did not have to be the Windows integration server.
Currently, from a clean build of HEAD, I'm getting

libraries\base\GHC\Event\TimerManager.hs:62:3: error:

     error: #error not implemented for this operating system

     # error not implemented for this operating system

       ^
I'd revert something if I could, but I can't see what to revert.  Help, please!
Simon
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