[Xcb] update to libxcb 1.12 breaks 32bit applications

[G. Schlisio]

>> I'm not sure what the problem is, then.  That looks like it should work
>> fine, given the code in that function.
> 
> building libxcb with O0 or O1 fixes this breakage, as someone discovered
> on our bugtracker.
> there also was a hint about arch recently switching to gcc6, might we
> see a bug in that one?


compiling libxcb 1.12 with gcc 5.3 and -O2 results in no crash in my
setup. looks like the bug is in gcc6 then.
thank you guys for helping!

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