closed issue:5020:The game still oriented in landscape mode when update the describes of orientation to Portrait in 'MainPage.xaml'.
Merge branch 'v3_wp8fix' of https://github.com/Dhilan007/cocos2d-x into v3-wp8
Merge pull request #6698 from Dhilan007/v3_wp8fix

[ci skip]closed issue:5020:The game still oriented in landscape mode when update the describes of orientation to Portrait in 'MainPage.xaml'.