[clang] [llvm] [clang-linker-wrapper] Add ELF packaging for spirv64-intel OpenMP images (PR #125737)

[Nick Sarnie via llvm-commits]

sarnex wrote:

yeah my test should only run if `LLVM_INCLUDE_SPIRV_TOOLS_TESTS` is set, which does not appear to be the case, so i'm surprised it's running. it indeed did not run in the clean build.

```
UNSUPPORTED: Clang :: Tooling/clang-linker-wrapper-spirv-elf.cpp (20383 of 84127)
```

the lit feature i added should only be enabled if `LLVM_INCLUDE_SPIRV_TOOLS_TESTS` is set, so to be honest i have no idea what the problem is

https://github.com/llvm/llvm-project/pull/125737