message: fixed Win32 compile warning
diff: #pragma once
  #if defined(_WIN32)
  + #if !defined(WIN32_LEAN_AND_MEAN)
  #define WIN32_LEAN_AND_MEAN
  + #endif
  + #if !defined(NOMINMAX)
  #define NOMINMAX
  + #endif
  #include <Windows.h>
  #elif defined(__APPLE__)
  #include <sys/sysctl.h>
  