[PATCH xserver] FlushAllOutput: Only call FlushCallbacks when actually flushing data

[Keith Packard]

Adam Jackson <ajax at nwnk.net> writes:

> My epoll branch has been rebased atop that as well.

I've rebased a nearly identical branch atop the two poll emulation
patches I just sent out in my tree.

I think we're ready to merge that code to master now; it should 'just
work' on mingw.

-- 
-keith
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