Everywhere: Fix order of includes and #pragma once

Userland/Libraries/LibC/bits/stdio_file_implementation.h

@@ -4,6 +4,8 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#pragma once
+
 #include <AK/Array.h>
 #include <AK/IntrusiveList.h>
 #include <AK/Types.h>
@@ -13,8 +15,6 @@
 #include <pthread.h>
 #include <sys/types.h>
 
-#pragma once
-
 struct FILE {
 public:
     FILE(int fd, int mode)