libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_sadmxn.h

-/*
- *  Copyright (c) 2010 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.
- */
-
-#ifndef VP9_COMMON_VP9_SADMXN_H_
-#define VP9_COMMON_VP9_SADMXN_H_
-
-#include "./vpx_config.h"
-#include "vpx/vpx_integer.h"
-
-static INLINE unsigned int sad_mx_n_c(const uint8_t *src_ptr,
-                                      int src_stride,
-                                      const uint8_t *ref_ptr,
-                                      int ref_stride,
-                                      int m,
-                                      int n) {
-  int r, c;
-  unsigned int sad = 0;
-
-  for (r = 0; r < n; r++) {
-    for (c = 0; c < m; c++) {
-      sad += abs(src_ptr[c] - ref_ptr[c]);
-    }
-
-    src_ptr += src_stride;
-    ref_ptr += ref_stride;
-  }
-
-  return sad;
-}
-
-#endif  // VP9_COMMON_VP9_SADMXN_H_