[driver] return immediately in `addArchSpecificRPath` and `getArchSpecificLibPaths` on AIX (#134520)
`addArchSpecificRPath` should immediately return for AIX as AIX doesn't
support `rpath` option.
`getArchSpecificLibPaths` should return as well as we don't want
`-L/ArchSepcificLibPaths` sent to the linker on AIX.