Add Xcode 9 Default Compiler Warnings
Add Xcode 9 Default Compiler Warnings

Summary: There a some more warnings, adding them to the base config

Reviewed By: zsol

Differential Revision: D5940394

fbshipit-source-id: 59b35189bb91f695a80ea4b9b6c5dba32184807f

facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl