build: remove entt library

include/entt/container/fwd.hpp

@@ -1,38 +0,0 @@
-#ifndef ENTT_CONTAINER_FWD_HPP
-#define ENTT_CONTAINER_FWD_HPP
-
-#include "../stl/functional.hpp"
-#include "../stl/memory.hpp"
-#include "../stl/utility.hpp"
-#include "../stl/vector.hpp"
-
-namespace entt {
-
-template<
-    typename Key,
-    typename Type,
-    typename = stl::hash<Key>,
-    typename = stl::equal_to<>,
-    typename = stl::allocator<stl::pair<const Key, Type>>>
-class dense_map;
-
-template<
-    typename Type,
-    typename = stl::hash<Type>,
-    typename = stl::equal_to<>,
-    typename = stl::allocator<Type>>
-class dense_set;
-
-template<typename...>
-class basic_table;
-
-/**
- * @brief Alias declaration for the most common use case.
- * @tparam Type Element types.
- */
-template<typename... Type>
-using table = basic_table<stl::vector<Type>...>;
-
-} // namespace entt
-
-#endif