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

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> Should it be named as `liboffload` or `liboffload.devicertl`?

I don't want `offload` since I think that should honestly be a separate library. I'll just call it `ompdevice` and be done with it.

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