[clang] [flang] [Flang] Add options frtlib-add-rpath and resource-dir (PR #88280)

[Tom Eccles via cfe-commits]

https://github.com/tblah commented:

Thanks for the fix. Other changes look good to me, but please wait for approval from @jhuber6

https://github.com/llvm/llvm-project/pull/88280