LibC: Don't include C++ headers in C system headers

Author: https://github.com/gunnarbeutner
Commit: 78c81854cc
Pull-request: https://github.com/SerenityOS/serenity/pull/9038

Userland/Libraries/LibC/wctype.cpp

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/Format.h>
 #include <wctype.h>
 
 extern "C" {

Userland/Libraries/LibC/wctype.h

@@ -6,7 +6,6 @@
 
 #pragma once
 
-#include <AK/Format.h>
 #include <assert.h>
 #include <ctype.h>
 #include <wchar.h>