[clang] [Clang] Forward -rpath flag to the correct format in CPU offloading (PR #95763)

[via cfe-commits]

mikaoP wrote:

Maybe I'm not getting what you say. I see that when you use `-fopenmp-targets=x86-64-unknown-linux-gnu` then no gcc command is issued. In any case, a clang command is run with `-rpath <path>` or `-Wl,-rpath,<path>`. The last is what this patch does only for CPU offloading. I guess that does not affect with nvlink, since this is npvtx offloading, right?

In the end, clang will understand both rpath formats, but the flag is forwarded to gcc, which only understand the `-Wl` one.

https://github.com/llvm/llvm-project/pull/95763