Add wasm32 target arch using same emscripten platform

src/platform/emscripten/mod.rs

@@ -1,4 +1,4 @@
-#![cfg(target_os = "emscripten")]
+#![cfg(any(target_os = "emscripten", target_arch = "wasm32"))]
 
 mod ffi;
 

src/platform/mod.rs

@@ -15,12 +15,13 @@ mod platform;
 #[cfg(target_os = "ios")]
 #[path="ios/mod.rs"]
 mod platform;
-#[cfg(target_os = "emscripten")]
+#[cfg(any(target_os = "emscripten", target_arch = "wasm32"))]
 #[path="emscripten/mod.rs"]
 mod platform;
 
 #[cfg(all(not(target_os = "ios"), not(target_os = "windows"), not(target_os = "linux"),
   not(target_os = "macos"), not(target_os = "android"), not(target_os = "dragonfly"),
   not(target_os = "freebsd"), not(target_os = "netbsd"), not(target_os = "openbsd"),
-  not(target_os = "emscripten")))]
+  not(target_os = "emscripten"),
+  not(target_arch = "wasm32")))]
 compile_error!("The platform you're compiling for is not supported by winit");