message: added to check the support of AVX2
diff: @@ -4253,6 +4253,7 @@ int normHamming(const uchar* a, int n)
  result += vgetq_lane_s32 (vreinterpretq_s32_u64(bitSet2),2);
  }
  #elif CV_AVX2
  + if (USE_AVX2)
  {
  __m256i _r0 = _mm256_setzero_si256();
  __m256i _0 = _mm256_setzero_si256();
  @@ -4303,6 +4304,7 @@ int normHamming(const uchar* a, const uchar* b, int n)
  result += vgetq_lane_s32 (vreinterpretq_s32_u64(bitSet2),2);
  }
  #elif CV_AVX2
  + if (USE_AVX2)
  {
  __m256i _r0 = _mm256_setzero_si256();
  __m256i _0 = _mm256_setzero_si256();
  