Slightly reduce number of cfgs (#3071)

* Make Linux platforms less dependent on the root monitor handle

* Add various functions to the Wayland platform to reduce cfgs

* Don't use a cfg in listen_device_events

* Don't use a cfg in set_content_protected

* Fix instance of a target_os cfg

src/platform_impl/orbital/window.rs

@@ -426,6 +426,8 @@ impl Window {
 
     #[inline]
     pub fn set_theme(&self, _theme: Option<window::Theme>) {}
+
+    pub fn set_content_protected(&self, _protected: bool) {}
 }
 
 impl Drop for Window {