libvpx: Pull from upstream

source/libvpx/vp8/encoder/psnr.h

Index: source/libvpx/vp8/encoder/psnr.h
===================================================================
--- source/libvpx/vp8/encoder/psnr.h	(revision 254565)
+++ source/libvpx/vp8/encoder/psnr.h	(working copy)
@@ -1,25 +0,0 @@
-/*
- *  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 VP8_ENCODER_PSNR_H_
-#define VP8_ENCODER_PSNR_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-extern double vp8_mse2psnr(double Samples, double Peak, double Mse);
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif
-
-#endif  // VP8_ENCODER_PSNR_H_