[libclc] [llvm] [libclc] Enable LLVM_RUNTIME_TARGETS in build system (PR #189892)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 commented:

Is it possible to just do like `ninja -C runtimes/runtimes-amdgcn-amd-amdhsa-llvm-bins check-libclc`?

https://github.com/llvm/llvm-project/pull/189892