Add a test that checks that EventsLoopProxy impls Send

tests/events_loop_proxy_send.rs

@@ -0,0 +1,8 @@
+extern crate winit;
+
+#[test]
+fn events_loop_proxy_send() {
+    // ensures that `winit::EventsLoopProxy` implements `Send`
+    fn needs_send<T:Send>() {}
+    needs_send::<winit::EventsLoopProxy>();
+}

tests/window_proxy_send.rs

@@ -1,9 +0,0 @@
-extern crate winit;
-
-#[cfg(feature = "window")]
-#[test]
-fn window_proxy_send() {
-    // ensures that `winit::WindowProxy` implements `Send`
-    fn needs_send<T:Send>() {}
-    needs_send::<winit::WindowProxy>();
-}