Make sure gcc4.6 is not used

source/libvpx/vp8/encoder/arm/neon/vp8_shortwalsh4x4_neon.c

 /*
  *  Copyright (c) 2014 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.
  */
 
 #include <arm_neon.h>
 
+#if (__GNUC__ == 4 && (__GNUC_MINOR__ == 6))
+#warning Using GCC 4.6 is not recommended
+// Some versions of gcc4.6 do not correctly process this function. When built
+// with any gcc4.6, use the C code.
+#include "./vp8_rtcd.h"
+void vp8_short_walsh4x4_neon(
+        int16_t *input,
+        int16_t *output,
+        int pitch) {
+  vp8_short_walsh4x4_c(input, output, pitch);
+}
+#else
 void vp8_short_walsh4x4_neon(
         int16_t *input,
         int16_t *output,
         int pitch) {
     uint16x4_t d16u16;
     int16x8_t q0s16, q1s16;
     int16x4_t dEmptys16, d0s16, d1s16, d2s16, d3s16, d4s16, d5s16, d6s16, d7s16;
     int32x4_t qEmptys32, q0s32, q1s32, q2s32, q3s32, q8s32;
     int32x4_t q9s32, q10s32, q11s32, q15s32;
     uint32x4_t q8u32, q9u32, q10u32, q11u32;
@@ skipping 86 matching lines @@
     d2s16 = vshrn_n_s32(q10s32, 3);
     d3s16 = vshrn_n_s32(q11s32, 3);
 
     q0s16 = vcombine_s16(d0s16, d1s16);
     q1s16 = vcombine_s16(d2s16, d3s16);
 
     vst1q_s16(output, q0s16);
     vst1q_s16(output + 8, q1s16);
     return;
 }
+#endif  // (__GNUC__ == 4 && (__GNUC_MINOR__ == 6))