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

[David Truby via cfe-commits]

https://github.com/DavidTruby commented:

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?

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