pub unsafe extern "C" fn rocksdb_backup_engine_info_number_files(
info: *const rocksdb_backup_engine_info_t,
index: c_int,
) -> u32
pub unsafe extern "C" fn rocksdb_backup_engine_info_number_files(
info: *const rocksdb_backup_engine_info_t,
index: c_int,
) -> u32