message: Fix C++17 as required standard mode
diff: @@ -10,7 +10,7 @@ set (CMAKE_C_STANDARD 11)
  #set (CMAKE_C_EXTENSIONS 0)
  set (CMAKE_C_STANDARD_REQUIRED 1)
  -set (CMAKE_CXX_STANDARD 14)
  +set (CMAKE_CXX_STANDARD 17)
  set (CMAKE_CXX_EXTENSIONS 0)
  set (CMAKE_CXX_STANDARD_REQUIRED 1)
  