CMakeLists: Indicate to ensure we use c++17

Author: qnixsynapse

engine/CMakeLists.txt

@@ -199,10 +199,8 @@ if(CMAKE_CXX_STANDARD LESS 17)
   message(STATUS "use c++14")
   find_package(Boost 1.61.0 REQUIRED)
   target_include_directories(${TARGET_NAME} PRIVATE ${Boost_INCLUDE_DIRS})
-elseif(CMAKE_CXX_STANDARD LESS 20)
-  message(STATUS "use c++17")
 else()
-  message(STATUS "use c++20")
+  message(STATUS "use c++17")
 endif()
 
 aux_source_directory(controllers CTL_SRC)