Fix build failure for clang, older gcc

Author: jagerman

include/pybind11/stl_bind.h

@@ -60,10 +60,10 @@ struct is_comparable<T, enable_if_t<container_traits<T>::is_pair>> {
 };
 
 /* Fallback functions */
-template <typename, typename> void vector_if_copy_constructible(...) { }
-template <typename, typename> void vector_if_equal_operator(...) { }
-template <typename, typename> void vector_if_insertion_operator(...) { }
-template <typename, typename> void vector_modifiers(...) { }
+template <typename, typename, typename... Args> void vector_if_copy_constructible(const Args &...) { }
+template <typename, typename, typename... Args> void vector_if_equal_operator(const Args &...) { }
+template <typename, typename, typename... Args> void vector_if_insertion_operator(const Args &...) { }
+template <typename, typename, typename... Args> void vector_modifiers(const Args &...) { }
 
 template<typename Vector, typename Class_>
 void vector_if_copy_constructible(enable_if_t<
@@ -413,8 +413,8 @@ pybind11::class_<Vector, holder_type> bind_vector(pybind11::module &m, std::stri
 NAMESPACE_BEGIN(detail)
 
 /* Fallback functions */
-template <typename, typename> void map_if_insertion_operator(...) { }
-template <typename, typename> void map_assignment(...) { }
+template <typename, typename, typename... Args> void map_if_insertion_operator(const Args &...) { }
+template <typename, typename, typename... Args> void map_assignment(const Args &...) { }
 
 // Map assignment when copy-assignable: just copy the value
 template <typename Map, typename Class_>