Upgrade to ndk 0.8, ndk-sys 0.5 + android-activity 0.5 releases

Fixes #2905.
Co-authored-by: Robert Bragg <robert@sixbynine.org>

src/platform_impl/android/keycodes.rs

@@ -555,6 +555,10 @@ pub fn to_logical(key_char: Option<KeyMapChar>, keycode: Keycode) -> Key {
             ThumbsUp => Key::Unidentified(native),
             ThumbsDown => Key::Unidentified(native),
             ProfileSwitch => Key::Unidentified(native),
+
+            // It's always possible that new versions of Android could introduce
+            // key codes we can't know about at compile time.
+            _ => Key::Unidentified(native),
         },
     }
 }