chore: deduplicate builtin help action generation.

src/source/parser/platform_parsers/macos_parser.cpp

@@ -25,13 +25,7 @@ namespace argument_parser {
 				}
 			}
 
-			add_argument({{flags::ShortArgument, "h"},
-						  {flags::LongArgument, "help"},
-						  {flags::Action, helpers::make_non_parametered_action([this]() {
-							   this->display_help(this->current_conventions());
-							   std::exit(0);
-						   })},
-						  {flags::HelpText, "Prints this help text."}});
+			prepare_help_flag();
 		}
 	} // namespace v2
 } // namespace argument_parser