WIN32 specific fix for (or at least work around to) STR #3143.

In testing, this resolves the reported issue, but I'd be happy if we could find a
solution that resolved the underlying issue of us missing PostThreadMessage()
messages passed from the worker thread to the main thread, whilst the main window
is unresponsive (i.e. moving or dragging.)

This also puts in place an amendment to the way the awake callback ring-buffer indices
are tested, when the buffer is wrapping over or near to full. This was identified by 
Albrecht in STR #3223 (item #1 on that STR, though there are a few other issues 
identified there.)

In my testing, this appears to be correct and robust. Further testing would not go
amiss, however.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10714 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

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