Fix Cpp17Destructible for pointer-to-class type

Author: saki7

test/core.cpp

@@ -369,6 +369,16 @@ TEST_CASE("Cpp17Destructible")
         STATIC_REQUIRE(!std::destructible<void>);
         STATIC_REQUIRE( std::destructible<int&>);
     }
+    {
+        // Pointer types *should* be destructible
+        STATIC_REQUIRE(iris::req::Cpp17Destructible<int*>);
+
+        struct Defined {};
+        STATIC_REQUIRE(iris::req::Cpp17Destructible<Defined*>);
+
+        struct Undefined;
+        STATIC_REQUIRE(iris::req::Cpp17Destructible<Undefined*>);
+    }
 }
 
 namespace {