fix for msan builds which set -DLIBYUV_DISABLE_X86=1

include/libyuv/compare_row.h

 /*
  *  Copyright 2013 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.
  */
 
@@ skipping 18 matching lines @@
 #define VISUALC_HAS_AVX2 1
 #endif  // VisualStudio >= 2012
 
 // clang >= 3.4.0 required for AVX2.
 #if defined(__clang__) && (defined(__x86_64__) || defined(__i386__))
 #if (__clang_major__ > 3) || (__clang_major__ == 3 && (__clang_minor__ >= 4))
 #define CLANG_HAS_AVX2 1
 #endif  // clang >= 3.4
 #endif  // __clang__
 
-#if defined(_M_IX86) && (defined(VISUALC_HAS_AVX2) || defined(CLANG_HAS_AVX2))
+#if !defined(LIBYUV_DISABLE_X86) && \
+    defined(_M_IX86) && (defined(VISUALC_HAS_AVX2) || defined(CLANG_HAS_AVX2))
 #define HAS_HASHDJB2_AVX2
 #endif
 
 // The following are available for Visual C and GCC:
 #if !defined(LIBYUV_DISABLE_X86) && \
     (defined(__x86_64__) || (defined(__i386__) || defined(_M_IX86)))
 #define HAS_HASHDJB2_SSE41
 #define HAS_SUMSQUAREERROR_SSE2
 #endif
 
@@ skipping 18 matching lines @@
 uint32 HashDjb2_C(const uint8* src, int count, uint32 seed);
 uint32 HashDjb2_SSE41(const uint8* src, int count, uint32 seed);
 uint32 HashDjb2_AVX2(const uint8* src, int count, uint32 seed);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_COMPARE_ROW_H_  NOLINT