While not necessary for swiftshader, this is needed to compare against certain system vulkan drivers.

Bug: b/128527271
Change-Id: I64c9e39659d565a0369c2989a324e4c09dbf7c02
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27773
Presubmit-Ready: Ben Clayton <headlessclayton@gmail.com>
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>