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

[Michał Górny via llvm-commits]

mgorny wrote:

I'm sorry, I've unmerged these packages already after trying an older commit. Lemme build them again.

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