message: Silence codecvt deprecation warning on VC++
diff: #ifndef _CNS_HPP
  #define _CNS_HPP
  +#ifdef _MSC_VER
  +// codecvt_* is deprecated in C++17 and MSVC will throw an annoying warning because of that.
  +// Defining this before anything else to silence it.
  +#define _SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING
  +#endif
  +
  #include <iostream>
  #include <stdio.h>
  #include <stdint.h>
  -// Can't use this in MSVC.
  #ifndef _MSC_VER
  #include <sys/time.h>
  #else
  +// Can't use this in MSVC.
  #include <time.h>
  #endif
  #include <cstring>
  