Use relative filenames for internal includes.

include/libyuv/convert_from.h

 /*
  *  Copyright 2011 The LibYuv 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 INCLUDE_LIBYUV_CONVERT_FROM_H_  // NOLINT
 #define INCLUDE_LIBYUV_CONVERT_FROM_H_
 
-#include "libyuv/basic_types.h"
-#include "libyuv/rotate.h"
+#include "basic_types.h"
+#include "rotate.h"
 
 #ifdef __cplusplus
 namespace libyuv {
 extern "C" {
 #endif
 
 // See Also convert.h for conversions from formats to I420.
 
 // I420Copy in convert to I420ToI420.
 
@@ skipping 146 matching lines @@
                     uint8* dst_sample, int dst_sample_stride,
                     int width, int height,
                     uint32 format);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_CONVERT_FROM_H_  NOLINT