Function sys_renameat2 

pub fn sys_renameat2(
    locked: &mut Locked<Unlocked>,
    current_task: &CurrentTask,
    old_dir_fd: FdNumber,
    old_user_path: UserCString,
    new_dir_fd: FdNumber,
    new_user_path: UserCString,
    flags: u32,
) -> Result<(), Errno>