The "SkRuntimeBlender_GPU" test started to fail with a segmentation fault
after recent updates, possibly with mesa to 23.2.1. However, this doesn't
seem to be true on all hardware, as Andronikos reported success on IRC and
Bordeaux also built the previous derivation.
* gnu/packages/graphics.scm (skia)[phases]: Add "SkRuntimeBlender_GPU" to
tests that are skipped in the check phase.
Change-Id: I4077ae89a58049628a90f8abd23395f9ba89047a