fast_perfect_hash: fix warning

Author: jll63

include/boost/openmethod/policies/fast_perfect_hash.hpp

@@ -150,7 +150,7 @@ struct fast_perfect_hash : type_hash {
         //! arguments.
         //! @param options Zero or more option objects.
         template<class... Options>
-        static auto finalize(std::tuple<Options...> opts) -> void {
+        static auto finalize(std::tuple<Options...>) -> void {
             detail::fast_perfect_hash_control<Registry>.clear();
         }
     };

include/boost/openmethod/policies/vptr_map.hpp

@@ -48,7 +48,7 @@ class vptr_map : public vptr {
         template<class ForwardIterator, class... Options>
         static void initialize(
             ForwardIterator first, ForwardIterator last,
-            std::tuple<Options...> opts) {
+            std::tuple<Options...>) {
             decltype(vptrs) new_vptrs;
 
             for (auto iter = first; iter != last; ++iter) {