escape double slash in BuildXCConfig.rb
escape double slash in BuildXCConfig.rb

luggg/react-native-config,luggit/react-native-config,luggit/react-native-config,luggit/react-native-config,luggit/react-native-config,luggg/react-native-config,luggit/react-native-config,luggg/react-native-config,luggit/react-native-config