replace gethostname with hostname

easytier/src/web_client/mod.rs

@@ -225,10 +225,7 @@ pub async fn run_web_client(
     let mut flags = global_ctx.get_flags();
     flags.bind_device = false;
     global_ctx.set_flags(flags);
-    let hostname = match hostname {
-        None => gethostname::gethostname().to_string_lossy().to_string(),
-        Some(hostname) => hostname,
-    };
+    let hostname = hostname.unwrap_or_else(|| hostname::get().unwrap_or_default().to_string_lossy().into_owned());
     Ok(WebClient::new(
         create_connector_by_url(c_url.as_str(), &global_ctx, IpVersion::Both).await?,
         token.to_string(),