[Xcb] update to libxcb 1.12 breaks 32bit applications

[G. Schlisio]

hi,

> Please recompile libxcb with debug symbols enabled so that the
> stack trace says more than just ??.

done so (hopefully) and uploaded a trace here [0].
gdb output while running was:

Program received signal SIGSEGV, Segmentation fault.
0xf50ed6d1 in remove_finished_readers (completed=<optimized out>,
prev_reader=0x980d0c8) at xcb_in.c:107
107         while(*prev_reader &&
XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, completed))

thank you for your hints and helps, hopefully made my report more usable
this time.

regards
georg

[0] http://pastebin.com/LSQktdui

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