tree-wide: place #pragma once at the same place everywhere

Usually, we place the #pragma once before the copyright blurb in header files,
but in a few cases we didn't. Move those around, so that we do the same thing
everywhere.

src/basic/btrfs-util.h

@@ -1,3 +1,5 @@
+#pragma once
+
 /***
   This file is part of systemd.
 
@@ -17,8 +19,6 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#pragma once
-
 #include <stdbool.h>
 #include <stdint.h>
 #include <sys/types.h>

src/basic/gunicode.h

@@ -1,11 +1,11 @@
+#pragma once
+
 /* gunicode.h - Unicode manipulation functions
  *
  *  Copyright (C) 1999, 2000 Tom Tromey
  *  Copyright 2000, 2005 Red Hat, Inc.
  */
 
-#pragma once
-
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdlib.h>

src/basic/login-util.h

@@ -1,3 +1,5 @@
+#pragma once
+
 /***
   This file is part of systemd.
 
@@ -17,8 +19,6 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#pragma once
-
 #include <stdbool.h>
 #include <unistd.h>
 

src/basic/sigbus.h

@@ -1,3 +1,5 @@
+#pragma once
+
 /***
   This file is part of systemd.
 
@@ -17,8 +19,6 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#pragma once
-
 void sigbus_install(void);
 void sigbus_reset(void);