RGBLINK lists local symbols when encountering an unknown symbol reference (#1496)

include/link/symbol.hpp

@@ -49,4 +49,6 @@ void sym_AddSymbol(Symbol &symbol);
  */
 Symbol *sym_GetSymbol(std::string const &name);
 
+void sym_DumpLocalAliasedSymbols(std::string const &name);
+
 #endif // RGBDS_LINK_SYMBOL_HPP