[PATCH:libXxf86vm] Tell the compiler it's unlikely we're talking to an XFree86 3.x server

[Keith Packard]

Alan Coopersmith <alan.coopersmith at oracle.com> writes:

> Hint that the current (XFree86 4.0 & later) version of the protocol
> is most common today.

I thought _X_UNLIKELY was to direct optimization? If so, it's hard to
see why we'd worry about that in this extension, unless you think
there's some documentation value here?

-- 
-keith
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