PVS-Studio warning V597 for Poco

void MD4Engine::transform (UInt32 state[4],
                           const unsigned char block[64])
{
  UInt32 a = state[0], b = state[1],
         c = state[2], d = state[3], x[16];
  decode(x, block, 64);
  ....
  /* Zeroize sensitive information. */
  std::memset(x, 0, sizeof(x));
}

This suspicious code was found in Poco project by PVS-Studio static code analyzer.
Warning message is:
V597 The compiler could delete the 'memset' function call, which is used to flush 'x' buffer. The RtlSecureZeroMemory() function should be used to erase the private data. Foundation md4engine.cpp 272

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