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

[Michael Kruse via llvm-commits]

Meinersbur wrote:

I second @shiltian's concern. Host-side and device-side libraries should have different names[^1] if there differences between them. We have host-offloading as well.

[^1]: Unless they would be interchangeable, i.e. contains host-side libomp, libomptarget AND device device-side devicertl code, if applicable for the respective target.

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