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testsuite: If validation result is not as expected, log the diff

Simon McVittie requested to merge wip/smcv/tools-validate-diff into main

It's easier to diagnose test failures if everything (within reason) is in the build log.

I'm seeing a test failure in this location on Debian riscv64, which turns out to be that when using GALLIUM_DRIVER=softpipe to work around LLVM JIT and therefore llvmpipe being known-broken on this architecture, something in the graphics driver stack repeatedly logs libEGL warning: egl: failed to create dri2 screen which is not one of the expected messages.

The actual test failure is probably more of a Mesa problem than a GTK problem, but the ability to diagnose it is useful.

Edited by Simon McVittie

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