Add more from the std

library/std/src/sys/net/hostname/mod.rs

@@ -0,0 +1,15 @@
+cfg_select! {
+    all(target_family = "unix", not(target_os = "espidf")) => {
+        mod unix;
+        pub use unix::hostname;
+    }
+    // `GetHostNameW` is only available starting with Windows 8.
+    all(target_os = "windows", not(target_vendor = "win7")) => {
+        mod windows;
+        pub use windows::hostname;
+    }
+    _ => {
+        mod unsupported;
+        pub use unsupported::hostname;
+    }
+}