pub unsafe extern "C" fn rocksdb_backupable_db_options_create(
backup_dir: *const c_char
) -> *mut rocksdb_backupable_db_options_t
pub unsafe extern "C" fn rocksdb_backupable_db_options_create(
backup_dir: *const c_char
) -> *mut rocksdb_backupable_db_options_t