[clang] [Driver] Generalize the `addFortranRuntimeLibs` function in `PPCLinux.cpp` to all Linux platform. (PR #134297)

[Daniel Chen via cfe-commits]

DanielCChen wrote:

Hello reviewers, 
This PR is an attempt to generalize the current code that re-uses `compilerRT` in `PPCLinux.cpp` to all Linux platforms.
Could you please comment if that is a feasible approach?

https://github.com/llvm/llvm-project/pull/134297