vpx_scale: add missing rtcd + vpx_scale includes

silences missing prototype warnings

Change-Id: I33320f66c789b8c5c51d69f9dc0e017f9e06b0d0

vpx_scale/generic/gen_scalers.c

@@ -8,7 +8,7 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-
+#include "./vpx_scale_rtcd.h"
 #include "vpx_scale/vpx_scale.h"
 #include "vpx_mem/vpx_mem.h"
 /****************************************************************************

vpx_scale/generic/vpx_scale.c

@@ -22,6 +22,7 @@
 ****************************************************************************/
 #include "./vpx_scale_rtcd.h"
 #include "vpx_mem/vpx_mem.h"
+#include "vpx_scale/vpx_scale.h"
 #include "vpx_scale/yv12config.h"
 
 typedef struct {

vpx_scale/generic/yv12extend.c

@@ -10,6 +10,7 @@
 
 #include <assert.h>
 #include "./vpx_config.h"
+#include "./vpx_scale_rtcd.h"
 #include "vpx/vpx_integer.h"
 #include "vpx_mem/vpx_mem.h"
 #include "vpx_ports/mem.h"