CMake 3.21.3 disables the broken hipcc-as-rocmclang detection again.
From the release notes:
> The AMD ROCm Platform hipcc compiler was identifed by CMake 3.21.0
> through 3.21.2 as a distinct compiler with id ROCMClang. This has been
> removed because it caused regressions. Instead:
> * hipcc may no longer be used as a HIP compiler because it interferes
> with flags CMake needs to pass to Clang. Use Clang directly.
> * hipcc may once again be used as a CXX compiler, and is treated as
> whatever compiler it selects underneath, as CMake 3.20 and below
> did.
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