[clang] [llvm] [OpenMP] Remove 'libomptarget.devicertl.a' fatbinary and use static library (PR #126143)

[Michał Górny via llvm-commits]

mgorny wrote:

Yeah, I can do that. I suppose a separate build would be cleaner in the long run — and hopefully it will let us build the CPU part cleanly with GCC xP.

https://github.com/llvm/llvm-project/pull/126143