[llvm] [openmp] [offload][openmp] - Remove standalone build in favor of 'runtimes' (PR #170693)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 commented:

Thanks for the work here! Just one concern, and also we should probably try to be consistent with `if ()` vs. `if()`. I think we prefer the latter.

https://github.com/llvm/llvm-project/pull/170693