The Bug: Using OSProcess to decapitate and recapitate a display will
often cause a multitude of "select: Bad file descriptor" errors.  Also,
socket serving becomes un-reliable after encountering these errors.

The attached solution solves the issue by adding a call to
aioStopHandling() from forgetXDisplay() (in sqXWindow.c).  This stops
the VM from attempting to poll the (now closed) file descriptor
associated with the X display.

This change is based on the sourceforge VM sources.  How does one go
about getting it checked into SF?

- Stephen
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