refact: suppress warns on macos (#12449)

Signed-off-by: fufesou <linlong1266@gmail.com>

src/lan.rs

@@ -1,3 +1,5 @@
+#[cfg(not(target_os = "ios"))]
+use hbb_common::whoami;
 use hbb_common::{
     allow_err,
     anyhow::bail,
@@ -10,7 +12,7 @@ use hbb_common::{
         self,
         sync::mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender},
     },
-    whoami, ResultType,
+    ResultType,
 };
 
 use std::{
@@ -45,7 +47,7 @@ pub(super) fn start_listening() -> ResultType<()> {
                             }
                             if let Some(self_addr) = get_ipaddr_by_peer(&addr) {
                                 let mut msg_out = Message::new();
-                                let mut hostname = whoami::hostname();
+                                let mut hostname = crate::whoami_hostname();
                                 // The default hostname is "localhost" which is a bit confusing
                                 if hostname == "localhost" {
                                     hostname = "unknown".to_owned();