Reduce the use of custom cfgs in examples

The `x11_platform`/`wayland_platform` cfgs remain (those are a lot more
involved, so it might still makes sense to use them for clarity).

winit/examples/util/fill.rs

@@ -12,11 +12,11 @@ use std::collections::HashMap;
 use std::mem;
 use std::mem::ManuallyDrop;
 use std::num::NonZeroU32;
-#[cfg(not(web_platform))]
+#[cfg(not(target_family = "wasm"))]
 use std::time::Instant;
 
 use softbuffer::{Context, Surface};
-#[cfg(web_platform)]
+#[cfg(target_family = "wasm")]
 use web_time::Instant;
 use winit::window::{Window, WindowId};
 

winit/examples/util/tracing.rs

@@ -1,4 +1,4 @@
-#[cfg(not(web_platform))]
+#[cfg(not(target_family = "wasm"))]
 pub fn init() {
     use tracing_subscriber::filter::{EnvFilter, LevelFilter};
 
@@ -9,7 +9,7 @@ pub fn init() {
         .init();
 }
 
-#[cfg(web_platform)]
+#[cfg(target_family = "wasm")]
 pub fn init() {
     use tracing_subscriber::layer::SubscriberExt;
     use tracing_subscriber::util::SubscriberInitExt;