Fix duplicate Signal import

Author: quantum-encoding

src/uu/timeout/src/timeout.rs

@@ -34,7 +34,7 @@ use uucore::{
     signals::{signal_by_name_or_value, signal_name_by_value},
 };
 
-use nix::sys::signal::{Signal, kill};
+use nix::sys::signal::kill;
 use nix::unistd::{Pid, getpid, setpgid};
 
 pub mod options {