[clang] [flang] [clang][Driver] Add the ability to specify that RPATH should be added by default (PR #115163)

[David Truby via cfe-commits]

DavidTruby wrote:

@pawosm-arm it looks like clang config files are sufficient for this and don't have the behaviour we thought was problematic? Can we drop this patch if I'm right in thinking that?

https://github.com/llvm/llvm-project/pull/115163