Bug#762403: gtk+ build failures

[Andreas Henriksson]

Hello!

For the record, the build failure on armel, arm64 and mipsel
is because of the gtk-reftest test failing.

(On mips the build seems to hang and eventually get killed
for unknown reason.)

A test build has been performed on armel schroot on a porter
box (abel) and the problem is reproducible.
As can be seen in the attached output from gtk-reftest there
are spurious pixels in the output.
A brief discussion with upstream developer Benjamin Otte
suggested that one possible cause for this might be
(incorrect/failing?) optimizations in pixman being
different on different architectures, but real investigation
is needed.

Other non-armel failing architectures have not been tested.

Regards,
Andreas Henriksson
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