surfaceless config failure with cts for zink+anv
If I try to run CTS tests with zink+anv on a surfaceless cts build, I get fbconfig failures, but it works fine with lavapipe or radv. I'm using this as my deqp options:
--deqp-surface-width=256 --deqp-surface-height=256 --deqp-surface-type=pbuffer --deqp-gl-config-name=rgba8888d24s8ms0 --deqp-visibility=hidden
cc @ajax