Remove deprecation warning from Dialyzer suite

Author: josevalim

lib/elixir/test/elixir/fixtures/dialyzer/struct_update.ex

@@ -116,11 +116,6 @@ defmodule Kernel.DialyzerTest do
     assert_dialyze_no_warnings!(context)
   end
 
-  test "no warnings on struct update", context do
-    copy_beam!(context, Dialyzer.StructUpdate)
-    assert_dialyze_no_warnings!(context)
-  end
-
   @tag warnings: [:specdiffs]
   test "no warnings on protocol calls with opaque types", context do
     alias Dialyzer.ProtocolOpaque