Include fix: use aom_integer.h

Change-Id: I98919a04bead417379e555461f67978501f922e7

args.c

diff --git a/args.c b/args.c
index a54cbf8..5829857 100644
--- a/args.c
+++ b/args.c
@@ -9,12 +9,12 @@
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */
 
-#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <limits.h>
 #include "args.h"
 
+#include "aom/aom_integer.h"
 #include "aom_ports/msvc.h"
 
 #if defined(__GNUC__) && __GNUC__