libvpx: Pull from upstream

source/libvpx/vp9/encoder/x86/vp9_avg_intrin_sse2.c

 /*
  *  Copyright (c) 2014 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 <emmintrin.h>
+
+#include "./vp9_rtcd.h"
 #include "vpx_ports/mem.h"
 
 void vp9_minmax_8x8_sse2(const uint8_t *s, int p, const uint8_t *d, int dp,
                          int *min, int *max) {
   __m128i u0, s0, d0, diff, maxabsdiff, minabsdiff, negdiff, absdiff0, absdiff;
   u0  = _mm_setzero_si128();
   // Row 0
   s0 = _mm_unpacklo_epi8(_mm_loadl_epi64((const __m128i *)(s)), u0);
   d0 = _mm_unpacklo_epi8(_mm_loadl_epi64((const __m128i *)(d)), u0);
   diff = _mm_subs_epi16(s0, d0);
@@ skipping 390 matching lines @@
 
   v1  = _mm_srli_si128(sse, 8);
   sse = _mm_add_epi32(sse, v1);
   v1  = _mm_srli_epi64(sse, 32);
   sse = _mm_add_epi32(sse, v1);
 
   mean = _mm_extract_epi16(sum, 0);
 
   return _mm_cvtsi128_si32(sse) - ((mean * mean) >> (bwl + 2));
 }