libvpx: Pull from upstream

source/libvpx/vp9/encoder/x86/vp9_subpel_variance_impl_intrin_avx2.c

 /*
  *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <immintrin.h>  // AVX2
+
+#include "./vp9_rtcd.h"
 #include "vpx_ports/mem.h"
 #include "vp9/encoder/vp9_variance.h"
 
 DECLARE_ALIGNED(32, static const uint8_t, bilinear_filters_avx2[512]) = {
   16, 0, 16, 0, 16, 0, 16, 0, 16, 0, 16, 0, 16, 0, 16, 0,
   16, 0, 16, 0, 16, 0, 16, 0, 16, 0, 16, 0, 16, 0, 16, 0,
   15, 1, 15, 1, 15, 1, 15, 1, 15, 1, 15, 1, 15, 1, 15, 1,
   15, 1, 15, 1, 15, 1, 15, 1, 15, 1, 15, 1, 15, 1, 15, 1,
   14, 2, 14, 2, 14, 2, 14, 2, 14, 2, 14, 2, 14, 2, 14, 2,
   14, 2, 14, 2, 14, 2, 14, 2, 14, 2, 14, 2, 14, 2, 14, 2,
@@ skipping 508 matching lines @@
         src_pack = src_reg;
         sec+= sec_stride;
         CALC_SUM_SSE_INSIDE_LOOP
         dst+= dst_stride;
       }
     }
   }
   CALC_SUM_AND_SSE
   return sum;
 }