Remove macOS port

We now have a proper native PC port (Moonlight Qt) and if we
wanted to bring the full iOS app over we can now use Catalyst.

Limelight/Stream/StreamManager.m

@@ -78,14 +78,12 @@
         }
     }
 
-#if TARGET_OS_IPHONE
     // Set mouse delta factors from the screen resolution and stream size
     CGFloat screenScale = [[UIScreen mainScreen] scale];
     CGRect screenBounds = [[UIScreen mainScreen] bounds];
     CGSize screenSize = CGSizeMake(screenBounds.size.width * screenScale, screenBounds.size.height * screenScale);
     [((StreamView*)_renderView) setMouseDeltaFactors:_config.width / screenSize.width
                                                    y:_config.height / screenSize.height];
-#endif
     
     // Populate the config's version fields from serverinfo
     _config.appVersion = appversion;