[llvm] [llvm-objdump] Fix --source with --macho flag (PR #163810)

[Daniel Rodríguez Troitiño via llvm-commits]

drodriguez wrote:

Restarted that failed job. There was no error. It might have been infra failure. Let's wait to see if we get green.

https://github.com/llvm/llvm-project/pull/163810