`libc/benchmarks/gpu/timing/CMakeLists.txt` did not correctly build `amdgpu` utils. This PR fixes that issue by adding `amdgpu` to the loop that adds the correct sub directories.
`libc/benchmarks/gpu/timing/CMakeLists.txt` did not correctly build `amdgpu` utils. This PR fixes that issue by adding `amdgpu` to the loop that adds the correct sub directories.