array: fix array_clone (fix #8220) (#8238)

vlib/builtin/array_test.v

@@ -1343,3 +1343,19 @@ fn test_multi_fixed_array_with_default_init() {
 	println(a)
 	assert a == [[10, 10, 10]!, [10, 10, 10]!, [10, 10, 10]!]!
 }
+
+struct Abc {
+mut:
+	x i64
+	y i64
+	z i64
+}
+
+fn test_clone_of_same_elem_size_array() {
+	mut arr := []Abc{}
+	arr << Abc{1, 2, 3}
+	arr << Abc{2, 3, 4}
+	arr2 := arr.clone()
+	println(arr2)
+	assert arr2 == [Abc{1, 2, 3}, Abc{2, 3, 4}]
+}