[Xcb] update to libxcb 1.12 breaks 32bit applications

[G. Schlisio]

> Since it is (*prev_reader)->request that is a double-dereference, yes?
> So the uint32_t at 0x980d0c8, which should be a pointer to a struct, is
> presumably the problem.

i have way to few clue about c programming to fully understand what you
are telling me. i am very sorry.
meanwhile some folks provided us with some traces from other programs,
you find them attached in the arch bug tracker [0].
hope this helps.

georg

[0] https://bugs.archlinux.org/task/49560


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