macos: Map our user generated event to Event::Awakened

This fixes propagation of Event::Awakend from wakeup_event_loop() when
using poll_event() on macOS.

Currently wait_event() translates all unknown events into
Event::Awakened so doesn't need the explicit translation.

src/platform/macos/mod.rs

@@ -822,6 +822,12 @@ unsafe fn NSEventToEvent(window: &Window, nsevent: id) -> Option<Event> {
         appkit::NSEventTypePressure => {
             Some(Event::TouchpadPressure(nsevent.pressure(), nsevent.stage()))
         },
+        appkit::NSApplicationDefined => {
+            match nsevent.subtype() {
+                appkit::NSEventSubtype::NSApplicationActivatedEventType => { Some(Event::Awakened) }
+                _ => { None }
+            }
+        },
         _  => { None },
     }
 }