Fix a couple of includes.

Include encoder_util.h correctly in encoder_util.c.
Ditto for aomenc.h in aomenc.c.

Change-Id: I4952b8be5cf8446736c65893320747f04a3b1703
diff --git a/apps/aomenc.c b/apps/aomenc.c
index c67b653..7d5148f 100644
--- a/apps/aomenc.c
+++ b/apps/aomenc.c
@@ -9,7 +9,8 @@
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */
 
-#include "aomenc.h"
+#include "apps/aomenc.h"
+
 #include "./aom_config.h"
 
 #include <assert.h>
diff --git a/examples/encoder_util.c b/examples/encoder_util.c
index 453484c..e43b372 100644
--- a/examples/encoder_util.c
+++ b/examples/encoder_util.c
@@ -11,7 +11,7 @@
 
 // Utility functions used by encoder binaries.
 
-#include "encoder_util.h"
+#include "examples/encoder_util.h"
 
 #include <assert.h>
 #include <string.h>