[Xcb] update to libxcb 1.12 breaks 32bit applications

[G. Schlisio]

> Can you try running the program under valgrind (without sanitizers).
> 
> There might be some noise, but I'd be interested in
> 
> - Whether it still crashes.

yes, it does

> - Whether there's a report before the crash (or where the crash would
>   have happened).

i am not sure how a crash report would look like but i dont see anything
looking like it in the output (see below)

> You can attach the valgrind output if there is any.

find it here: http://pastebin.com/1RWh34HW

thank you for your suggestions!

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