message: mavlink_ftp: replace dirent for Windows
diff: +#if defined(WINDOWS)
  +#include "tronkko_dirent.h"
  +#include <direct.h>
  +#define mkdir(D, M) _mkdir(D)
  +#else
  #include <dirent.h>
  +#endif
  +
  #include <fcntl.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #define PATH_MAX 4096
  #endif
  -#ifdef _WIN32
  -#include <direct.h>
  -#define mkdir(D, M) _mkdir(D)
  -#endif
  -
  bool fs_exists(const std::string& filename)
  {
  struct stat buffer;
  