[Xcb] xcb-util configure.ac

[Barton C Massey]

I put this on my bug list last night.  Thank you for the fix!

Can someone commit this patch please?  

	Bart

In message <e63a4b7d050729090211e659ad at mail.gmail.com> you wrote:
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> Both at home and at work I didn't have gperf, but the apparent success
> of xcb-util's configure.ac made me think everything was okay until the
> compile step, when it failed. What do people think of the attached
> diff? It'll stop the ./configure if it can't find gperf.
> 
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