[clang] [flang-rt] Pass the whole path of libflang_rt.runtime.a to linker on AIX (PR #131041)

[Daniel Chen via cfe-commits]

DanielCChen wrote:

> With this PR applied? It hardcodes `libflang_rt.runtime.a` on AIX, how can it find the `.so`?

Sorry, I just realized on AIX,  both static and shared library are named `.a`, which is why it didn't fail for me. But it is not the case for other platforms. 

https://github.com/llvm/llvm-project/pull/131041