fix CI failed build on linux

src/server.rs

@@ -13,6 +13,7 @@ use hbb_common::{
     sodiumoxide::crypto::{box_, secretbox, sign},
     timeout, tokio, ResultType, Stream,
 };
+#[cfg(target_os = "macos")]
 use notify::{watcher, RecursiveMode, Watcher};
 use parity_tokio_ipc::ConnectionClient;
 use service::{GenericService, Service, ServiceTmpl, Subscriber};

src/ui.rs

@@ -364,7 +364,8 @@ impl UI {
         }
         ipc::set_options(options.clone()).ok();
 
-        if cfg!(target_os = "macos") && &key == "stop-service" {
+        #[cfg(target_os = "macos")]
+        if &key == "stop-service" {
             crate::platform::macos::launch_or_stop_daemon(value != "Y");
         }
     }