 - revised so that a NULL winid passed into glk_window_close is a fatal     error if the call is also trying to retrieve the stream result.
 - revised so that a NULL winid passed into glk_window_close is a fatal 
   error if the call is also trying to retrieve the stream result.


git-svn-id: f63ed4a3d795cbc704c6f96f5f2039ac9dca152b@40 fa1805ff-ec47-0410-9496-756a55e85969

tunesmith/CocoaGlk,tunesmith/CocoaGlk,tunesmith/CocoaGlk,tunesmith/CocoaGlk,tunesmith/CocoaGlk