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

[David Truby via cfe-commits]

https://github.com/DavidTruby commented:

Change LGTM in general but I'd like Windows to have tests before approving as we need this to be working there too

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