Fix Clippy 1.43 warnings (#399)

src/main.rs

@@ -21,8 +21,6 @@ use self::steps::*;
 use self::terminal::*;
 use anyhow::{anyhow, Result};
 use log::debug;
-#[cfg(feature = "self-update")]
-use openssl_probe;
 use std::env;
 use std::io;
 use std::process::exit;