message: build: add missing GCC condition for pragma
diff: @@ -829,14 +829,19 @@ else // CV_8U
  v_pack_store(dst + k, __pack01);
  }
  #endif
  +
  +#if defined(__GNUC__) && __GNUC__ >= 9
  // avoid warning "iteration 7 invokes undefined behavior" on Linux ARM64
  #pragma GCC diagnostic push
  #pragma GCC diagnostic ignored "-Waggressive-loop-optimizations"
  +#endif
  for( ; k < len; k++ )
  {
  dst[k] = saturate_cast<uchar>(rawDst[k]*nrm2);
  }
  +#if defined(__GNUC__) && __GNUC__ >= 9
  #pragma GCC diagnostic pop
  +#endif
  }
  #else
  float* dst = dstMat.ptr<float>(row);
  