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/macos/event_loop.rs

@@ -27,7 +27,9 @@ use super::appkit::{NSApp, NSApplication, NSApplicationActivationPolicy, NSEvent
 use crate::{
     error::EventLoopError,
     event::Event,
-    event_loop::{ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootWindowTarget},
+    event_loop::{
+        ControlFlow, DeviceEvents, EventLoopClosed, EventLoopWindowTarget as RootWindowTarget,
+    },
     platform::{macos::ActivationPolicy, pump_events::PumpStatus},
     platform_impl::platform::{
         app::WinitApplication,
@@ -84,6 +86,9 @@ impl<T: 'static> EventLoopWindowTarget<T> {
         Some(monitor)
     }
 
+    #[inline]
+    pub fn listen_device_events(&self, _allowed: DeviceEvents) {}
+
     #[inline]
     pub fn raw_display_handle(&self) -> RawDisplayHandle {
         RawDisplayHandle::AppKit(AppKitDisplayHandle::empty())