[Openmp-commits] [openmp] [openmp][testing] disable check targets if not building with clang (PR #71866)

[Maksim Levental via Openmp-commits]

makslevental wrote:

I should note that I did discover that this combination of flags is a workaroud

```
-DOPENMP_STANDALONE_BUILD=ON
-DOPENMP_ENABLE_LIBOMPTARGET=OFF
```

but I don't like it because this ends up building `libclang` for some reason (which I would of course prefer not do).

https://github.com/llvm/llvm-project/pull/71866