avoid vectors for pnacl which cause linker failure.

include/libyuv/row.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.
  */
 
@@ skipping 366 matching lines @@
 typedef __declspec(align(16)) int8 vec8[16];
 typedef __declspec(align(16)) uint16 uvec16[8];
 typedef __declspec(align(16)) uint32 uvec32[4];
 typedef __declspec(align(16)) uint8 uvec8[16];
 typedef __declspec(align(32)) int16 lvec16[16];
 typedef __declspec(align(32)) int32 lvec32[8];
 typedef __declspec(align(32)) int8 lvec8[32];
 typedef __declspec(align(32)) uint16 ulvec16[16];
 typedef __declspec(align(32)) uint32 ulvec32[8];
 typedef __declspec(align(32)) uint8 ulvec8[32];
-#elif defined(__GNUC__)
+#elif defined(__GNUC__) && !defined(__pnacl__)
 // Caveat GCC 4.2 to 4.7 have a known issue using vectors with const.
 #define SIMD_ALIGNED(var) var __attribute__((aligned(16)))
 #define SIMD_ALIGNED32(var) var __attribute__((aligned(64)))
 typedef int16 __attribute__((vector_size(16))) vec16;
 typedef int32 __attribute__((vector_size(16))) vec32;
 typedef int8 __attribute__((vector_size(16))) vec8;
 typedef uint16 __attribute__((vector_size(16))) uvec16;
 typedef uint32 __attribute__((vector_size(16))) uvec32;
 typedef uint8 __attribute__((vector_size(16))) uvec8;
 typedef int16 __attribute__((vector_size(32))) lvec16;
@@ skipping 1751 matching lines @@
 void ARGBLumaColorTableRow_SSSE3(const uint8* src_argb, uint8* dst_argb,
                                  int width,
                                  const uint8* luma, uint32 lumacoeff);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_ROW_H_  NOLINT