[lld] [lld-macho] Ignore -no_warn_duplicate_libraries flag (PR #86303)

[Vincent Lee via llvm-commits]

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@@ -1407,3 +1407,7 @@ def debug_variant : Flag<["-"], "debug_variant">,
     HelpText<"Do not warn about issues that are only problems for binaries shipping to customers.">,
     Flags<[HelpHidden]>,
     Group<grp_ignored_silently>;
+def no_warn_duplicate_libraries : Flag<["-"], "no_warn_duplicate_libraries">,
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thevinster wrote:

If someone were to implement `-warn_duplicate_libraries`, then we won't want to ignore this flag anymore, right? I'd leave a comment above this line if that were the case. 

https://github.com/llvm/llvm-project/pull/86303