message: [lldb][CMake] Fix one more detail in r368066
diff: include(${CMAKE_CURRENT_LIST_DIR}/Apple-lldb-base.cmake)
  -set(CMAKE_GENERATOR Xcode)
  +set(CMAKE_GENERATOR Xcode CACHE STRING "")
  set(CMAKE_OSX_DEPLOYMENT_TARGET 10.11 CACHE STRING "")
  set(CMAKE_XCODE_GENERATE_SCHEME ON CACHE BOOL "")
  