This avoids a whole pile of nonsense that we don't need during the dEQP
build, which is helpful when you build it five times in a row. In
particular, not building the Vulkan validation layers means we don't
waste three minutes building a second copy of SPIRV-Tools which we never
use.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Eric Engestrom <None>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33287>
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