[clang] [flang] [Driver] Ensure ToolChain::LibraryPaths is not empty for non-Darwin (PR #88661)

[Arthur Eubanks via cfe-commits]

https://github.com/aeubanks approved this pull request.

lg, but update the commit message `Pull Request: https://github.com/llvm/llvm-project/pull/87866`, that's obsolete

https://github.com/llvm/llvm-project/pull/88661