[llvm] [Flang-RT] Do not use Apple-specific libdir scheme (PR #151954)

[Paul H. Hargrove via llvm-commits]

PHHargrove wrote:

This did not resolve the problem because the new location is not in the linker's search path.  
I will add the linker command from `flang -v` output to issue #151031 

https://github.com/llvm/llvm-project/pull/151954