message: flann: fix build with MSVC /sdl option
diff: @@ -63,7 +63,12 @@ class Logger
  stream = stdout;
  }
  else {
  +#ifdef _MSC_VER
  + if (fopen_s(&stream, name, "w") != 0)
  + stream = NULL;
  +#else
  stream = fopen(name,"w");
  +#endif
  if (stream == NULL) {
  stream = stdout;
  }
  