[llvm] [Offload] libomptarget force dlopen vendor libraries by default. (PR #92788)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 approved this pull request.

Looks good after discussion with others. I will probably rework the logic here later to make it more consistent, but this is fine for now.

https://github.com/llvm/llvm-project/pull/92788