Fix build error when modules are disabled
Fix build error when modules are disabled

Reference issue: https://github.com/iziz/libPhoneNumber-iOS/issues/132
opentable/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,opentable/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS,iziz/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS,opentable/libPhoneNumber-iOS,dmaclach/libPhoneNumber-iOS,wheniwork/libPhoneNumber-iOS