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

[Michał Górny via llvm-commits]

mgorny wrote:

How did you disable it? Perhaps it's failing because of the specific error:

```
$ nvptx-arch                                                                                                            
Failed to 'dlopen' libcuda.so.1
```

For comparison, `amdgpu-arch` doesn't print anything.

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