[Development] Qt 5 and old versions of XCB

[Bradley Smith]

>
> Every Linux distro uses X.org, which uses XCB.
>
 
 Including openSUSE 11.1, but just any XCB is not enough. It needs to be 
more recent than some version. For users with an incompatible version of 
XCB, I think we can provide a better user experience than hitting compiler 
errors when building Qt. If someone knows the minimum version required, 
hopefully configure tests can check for it.

While trying to upgrade XCB, I also found that OpenGL support was only 
enabled if the xcb-xlib configuration test passed. I don't believe this 
limitation was reported by the configuration output either.
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