Remove unused concept non_pointer_like

Author: filipsajdak

include/cpp2util.h

@@ -336,9 +336,6 @@ concept polymorphic_pointer = pointer<X> && polymorphic<std::remove_pointer_t<X>
 template <typename X>
 concept pointer_like = requires (X x) { *x; X{}; };
 
-template <typename X>
-concept non_pointer_like = !pointer_like<X>;
-
 template <typename From, typename To>
 concept valid_convertible_to = requires (From x){ To{x}; };