fixes #24147; Copy hook causes an incompatible-pointer-types (#24149)

fixes #24147

(cherry picked from commit 5c843d3d60)

tests/arc/tarc_orc.nim

@@ -160,3 +160,16 @@ block:
     testCase()
 
   main()
+
+block: # bug #24147
+  type
+    O = object of RootObj
+      val: string
+    OO = object of O
+
+  proc `=copy`(dest: var O, src: O) =
+      dest.val = src.val
+
+  let oo = OO(val: "hello world")
+  var ooCopy : OO
+  `=copy`(ooCopy, oo)