[lld] [lld][MachO] Prevent doubled N_SO when comp_dir and name absolute (PR #71608)

[Daniel Thornburgh via llvm-commits]

================
@@ -0,0 +1,58 @@
+# REQUIRES: x86
----------------
mysterymath wrote:

I was hesitant to try to add another file there given it's complexity, but I'll give it a stab.

https://github.com/llvm/llvm-project/pull/71608