[Xcb] update to libxcb 1.12 breaks 32bit applications

Tue Jun 7 07:44:51 UTC 2016

> 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?

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