[Xcb] print backtraces in case an assert fails inside xlib/xcb

[Jamey Sharp]

I'm not Josh but I've reviewed and pushed your patch. It looked perfect
to me; thanks very much! We should get a release out soon with this.

On Wed, Jun 06, 2007 at 01:56:24PM -0700, Barton C Massey wrote:
> BTW, might want to add a line or two to indicate when the
> backtrace has been truncated to 20 lines...

I agree with Bart; a further patch for this would be welcome. I don't
think it's very important though.

--Jamey
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