PVS-Studio warning V597 for Apache

static void MD4Transform(
  apr_uint32_t state[4], const unsigned char block[64])
{
  apr_uint32_t a = state[0], b = state[1],
               c = state[2], d = state[3],
               x[APR_MD4_DIGESTSIZE];
  ....
  /* Zeroize sensitive information. */
  memset(x, 0, sizeof(x));
}

This suspicious code was found in Apache 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. apr apr_md4.c 362

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