tree-wide: sort includes

Sort the includes accoding to the new coding style.

src/basic/fileio-label.c

@@ -20,9 +20,9 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include "util.h"
-#include "selinux-util.h"
 #include "fileio-label.h"
+#include "selinux-util.h"
+#include "util.h"
 
 int write_string_file_atomic_label(const char *fn, const char *line) {
         int r;