cocos2d-x: Enable Multi-touch support in iOS

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To enable multi-touch support in iOS:

CCEAGLView *eaglView = [CCEAGLView viewWithFrame: [window bounds]
                                     pixelFormat: (NSString*)cocos2d::GLViewImpl::_pixelFormat
                                     depthFormat: cocos2d::GLViewImpl::_depthFormat
                              preserveBackbuffer: NO
                                      sharegroup: nil
                                   multiSampling: NO
                                 numberOfSamples: 0 ];
    
// Enable or disable multiple touches
[eaglView setMultipleTouchEnabled:YES];

And register EventListenerTouchAllAtOnce  as following:

auto listener= EventListenerTouchAllAtOnce::create();
listener->onTouchesBegan= CC_CALLBACK_2(GameLayer::onTouchesBegan, this);
listener->onTouchesMoved= CC_CALLBACK_2(GameLayer::onTouchesMoved, this);
listener->onTouchesEnded= CC_CALLBACK_2(GameLayer::onTouchesEnded, this);
listener->onTouchesCancelled= CC_CALLBACK_2(GameLayer::onTouchesCancelled, this);
Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener, this);