[clang] [flang] [clang][driver] Special care for linker flags in config files (PR #117573)

[Paul Osmialowski via cfe-commits]

pawosm-arm wrote:

> This LGTM but I think the other reviewers need to take a look too. Can you change the title and description of the PR/commit to represent that what we're doing is different now?

The commit title and message has been changed already, the PR description comment too, I've updated the PR title.

https://github.com/llvm/llvm-project/pull/117573