[clang] [llvm] [openmp] [Libomptarget] Statically link all plugin runtimes (PR #87009)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> Some OMPT variables with the same name used to be present in both libomptarget and the common plugin interface. These should probably be re-worked in the new scheme of static linking? e.g. llvm::omp::target::ompt::Initialized

Unsure, there was an issue where each plugin called `Initialize` separately that is no longer needed. I just deleted those. Are there any other cases that need to be handled?

https://github.com/llvm/llvm-project/pull/87009