[Xcb] update to libxcb 1.12 breaks 32bit applications

[G. Schlisio]

>> It looks like it spawns subprocesses (some startup script maybe). Please
>> try `valgrind --trace-children ./my_program` then.
> 
> Meant to write `--trace-children=yes`.

ok, with valgrind-multilib and tracing children i yield this:
http://pastebin.com/nhyJ4hY3

crashes but at first glance i dont see something like a chrash report.

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