[clang] [clang][driver] Remove -v from mkdir & ln -s from a test since it fails on ppc64 (PR #72924)

[Liviu Ionescu via cfe-commits]

ilg-ul wrote:

@ldionne, could you take a look? This should fix the bug introduced by the previous PR.

https://github.com/llvm/llvm-project/pull/72924