Remove unneeded "extern crate"

Author: tesuji

tests/client-of-myself.rs

@@ -1,5 +1,3 @@
-extern crate jobserver;
-
 use std::env;
 use std::io::prelude::*;
 use std::io::BufReader;

tests/client.rs

@@ -1,10 +1,3 @@
-extern crate futures;
-extern crate jobserver;
-extern crate num_cpus;
-extern crate tempdir;
-extern crate tokio_core;
-extern crate tokio_process;
-
 use std::env;
 use std::fs::File;
 use std::io::Write;

tests/make-as-a-client.rs

@@ -1,6 +1,3 @@
-extern crate jobserver;
-extern crate tempdir;
-
 use std::env;
 use std::fs::File;
 use std::io::prelude::*;

tests/server.rs

@@ -1,6 +1,3 @@
-extern crate jobserver;
-extern crate tempdir;
-
 use std::env;
 use std::fs::File;
 use std::io::prelude::*;