Fix b43e878 where xcodebuild sometimes failed by removing Carthage.build folder in xcodeproj.
Fix b43e878 where xcodebuild sometimes failed by removing Carthage.build folder in xcodeproj.

luzefeng/SwiftTask,iosyoujian/SwiftTask,marinehero/SwiftTask,marinehero/SwiftTask,marinehero/SwiftTask,luzefeng/SwiftTask,luzefeng/SwiftTask,luzefeng/SwiftTask,iosyoujian/SwiftTask,msdgwzhy6/SwiftTask,marinehero/SwiftTask,ReactKit/SwiftTask,msdgwzhy6/SwiftTask,msdgwzhy6/SwiftTask,iosyoujian/SwiftTask,iosyoujian/SwiftTask,ReactKit/SwiftTask,msdgwzhy6/SwiftTask,ReactKit/SwiftTask