CI-shaderc-smoketest failing due to new dependency on spirv-cross

Example of the failure: https://source.cloud.google.com/results/invocations/e397caa0-9ecf-4ef3-a5d6-48660adf0ce1/targets

I believe this failure is occuring due this commit in shaderc: https://github.com/google/shaderc/commit/a0a4695765d8641576c3e34294145c345b50dbdc