Add clippy to .gitlab-ci.yml

5 jobs for clippy in 15 minutes and 59 seconds (queued for 32 seconds)
latest
Name Stage Failure
failed
fmt Test
-        let file = match File::open(pathname, fcntl::O_PATH | fcntl::O_SYMLINK | fcntl::O_CLOEXEC) {
+ let file = match File::open(
+ pathname,
+ fcntl::O_PATH | fcntl::O_SYMLINK | fcntl::O_CLOEXEC,
+ ) {
Ok(ok) => ok,
Err(_) => return -1,
};
ERROR: Job failed: exit code 1
failed
clippy:redox Test
   |
= help: for further information visit https://rust-lang-nursery.github.io/rust-clippy/v0.0.212/index.html#op_ref

error: aborting due to 140 previous errors

error: Could not compile `relibc`.

To learn more, run the command again with --verbose.
ERROR: Job failed: exit code 1