WinHugs, back to life

[Neil Mitchell]

Hi,

I'm not sure before that WinHugs was correctly defining
HUGS_FOR_WINDOWS, some places that conditionaled on it seem to have
not hit it. This puts a definition in the WinHugs config.h file, so it
should be remembered.

Additionally, once this happens a few things break. This patch cleans
them back up. kbhit was referencing dead window handles, and since I
don't really have a clue what its meant to do, defining it as nothing
seems reasonable.

Thanks

Neil
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