[clang] [Clang][Driver] Override Generic_ELF::buildLinker() to avoid calling gcc to link (PR #149681)

[via cfe-commits]

mintsuki wrote:

> Can you add a test to clang/test/Driver to show the behavior difference ?

@MaskRay done. Does this work?

https://github.com/llvm/llvm-project/pull/149681