[clang] [clang][test] Restore UNSUPPORTED: darwin for OpenMP offload tests (PR #186208)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> The simplest fix I can think of that doesn't require major restructuring is to teach `TranslateOpenMPTargetArgs` not to drop `-mlinker-version`, similar to how `mcode_object_version_EQ` is handled.

That sounds reasonable to me

https://github.com/llvm/llvm-project/pull/186208