This pr fixes compiling facebook-ios-sdk and facebook-swift-sdk with latest xcode 10 using carthage by implementing the fixes described in https://github.com/facebook/facebook-sdk-swift/issues/246
ps: to be clear, when building Bolts directly using Carthage there was no issues at all, including compiling on latest beta 6, it is just when compiling either facebook-ios-sdk or facebook-swift-sdk that the problem arises