Function __map_mman_error

cpp/src/arrow/io/mman.h:42–46

#endif

static inline int __map_mman_error(const DWORD err, const int deferr) {
  if (err == 0) return 0;
  // TODO: implement
  return err;
}

static inline DWORD __map_mmap_prot_page(const int prot) {
  DWORD protect = 0;