ci: werror in meson-vulkan and meson-testing
From the last commit:
ci: Enable -Werror on meson-vulkan and meson-testing.
I want to make sure that I don't introduce warnings in turnip where we
have active work going on, and I also want to make sure that the drivers
we care about testing are warnings-clean.
As with the previous -Werror change, this is for CI only and doesn't
affect end-user builds.
Next set of warnings cleanliness protection. Note that it caught an actual bug in llvmpipe that was introduced recently (though not in a live code path).
@airlied for the llvmpipe changes