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/Input/ControllerSupport.h

@@ -6,10 +6,6 @@
 //  Copyright (c) 2014 Moonlight Stream. All rights reserved.
 //
 
-// Swift
-#if !TARGET_OS_IPHONE
-#import "Gamepad.h"
-#endif
 #import "StreamConfiguration.h"
 #import "Controller.h"
 
@@ -19,15 +15,9 @@
 
 -(id) initWithConfig:(StreamConfiguration*)streamConfig;
 
-#if TARGET_OS_IPHONE
 -(void) initAutoOnScreenControlMode:(OnScreenControls*)osc;
 -(void) cleanup;
 -(Controller*) getOscController;
-#else
--(void) assignGamepad:(struct Gamepad_device *)gamepad;
--(void) removeGamepad:(struct Gamepad_device *)gamepad;
--(NSMutableDictionary*) getControllers;
-#endif
 
 -(void) updateLeftStick:(Controller*)controller x:(short)x y:(short)y;
 -(void) updateRightStick:(Controller*)controller x:(short)x y:(short)y;