[Xcb] update to libxcb 1.12 breaks 32bit applications

[G. Schlisio]

> There are some errors, but seem unrelated. So, this didn't help.
> 
> If you are willing to put in a bit of effort, given that the program
> works with 1.11 but not with 1.12, the best way would be to find the git
> commit which caused the regression. The easiest way to do that is to use
> "git bisect".
.

ok, i will do the bisecting tomorrow, but first i should test whether
compiling 1.11.1 with gcc6 breaks things as well. atm it doesnt compile,
so i'll have to try harder.
i'll report back with results (hopefully!).

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