[clang] [Driver] Ensure ToolChain::LibraryPaths is not empty for non-Darwin (PR #87866)

[YunQiang Su via cfe-commits]

wzssyqa wrote:

@aeubanks The problem is that in your configure, the libclang_rt is please in `<builddir>/lib/clang/19/lib/linux/libclang_rt.builtins-arm-android.a`, instead of
`<buildir>/lib/clang/19/lib/arm-unknown-linux-android/libclang_rt.builtins.a`.

https://github.com/llvm/llvm-project/pull/87866