WinHugs, back to life

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