feat: mark Data.Nat.PrimeNormNum as ported (#4253)

The `norm_num` extension was already ported in #3892, so this PR adopts the same approach as #3816.

Mathlib.lean

@@ -1197,6 +1197,7 @@ import Mathlib.Data.Nat.Periodic
 import Mathlib.Data.Nat.Pow
 import Mathlib.Data.Nat.Prime
 import Mathlib.Data.Nat.PrimeFin
+import Mathlib.Data.Nat.PrimeNormNum
 import Mathlib.Data.Nat.Set
 import Mathlib.Data.Nat.Size
 import Mathlib.Data.Nat.Sqrt

Mathlib/Data/Nat/PrimeNormNum.lean

@@ -0,0 +1,23 @@
+/-
+Copyright (c) 2015 Microsoft Corporation. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+Authors: Leonardo de Moura, Jeremy Avigad, Mario Carneiro
+
+! This file was ported from Lean 3 source module data.nat.prime_norm_num
+! leanprover-community/mathlib commit 10b4e499f43088dd3bb7b5796184ad5216648ab1
+! Please do not edit these lines, except to modify the commit id
+! if you have ported upstream changes.
+-/
+import Mathlib.Data.Nat.Factors
+import Mathlib.Data.Nat.Prime
+import Mathlib.Tactic.NormNum
+
+/-!
+# Primality prover
+
+This file provides a `norm_num` extention to prove that natural numbers are prime.
+
+Porting note: the sole purpose of this file is to mark it as "ported".
+This file seems to be tripping up the porting dashboard.
+
+-/