Use vpx_integer.h instead of stdint.h

vpx_integer accounts for win32, which does not have stdint.h

Change-Id: I0ecf243ba56ed2e920e1293a6876c2e1ef1af99e

test/acm_random.h

@@ -11,9 +11,10 @@
 #ifndef LIBVPX_TEST_ACM_RANDOM_H_
 #define LIBVPX_TEST_ACM_RANDOM_H_
 
-#include <stdint.h>
 #include <stdlib.h>
 
+#include "vpx/vpx_integer.h"
+
 namespace libvpx_test {
 
 class ACMRandom {