[Mach-O] Ignore -no_deduplicate

macho/cmdline.cc

@@ -19,6 +19,7 @@ Options:
   -help                       Report usage information
   -l<LIB>                     Search for a given library
   -lto_library <FILE>         Ignored
+  -no_deduplicate             Ignored
   -o FILE                     Set output filename
   -platform_version <PLATFORM> <MIN_VERSION> <SDK_VERSION>
                               Set platform, platform version and SDK version
@@ -144,6 +145,7 @@ void parse_nonpositional_args(Context &ctx,
     } else if (read_arg("-lto_library")) {
     } else if (read_joined("-l")) {
       remaining.push_back("-l" + std::string(arg));
+    } else if (read_flag("-no_deduplicate")) {
     } else if (read_arg("-o")) {
       ctx.arg.output = arg;
     } else if (read_arg3("-platform_version")) {

macho/mold.h

@@ -577,6 +577,7 @@ struct Context {
 
   // Command-line arguments
   struct {
+    bool deduplicate = true;
     bool demangle = false;
     bool dynamic = true;
     bool fatal_warnings = false;