/apps/twnlua: mark with CODEGEN

apps/twnlua/CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.21)
-
+cmake_policy(SET CMP0171 NEW)
 project(twnlua LANGUAGES C)
 
 if(NOT CMAKE_BUILD_TYPE)
@@ -16,6 +16,7 @@ add_custom_command(
    OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/luabind.c
    COMMAND ${PYTHON3} ${CMAKE_CURRENT_SOURCE_DIR}/bindgen.py $ENV{TWNROOT}/share/twn_api.json ${FLAGS} > ${CMAKE_CURRENT_SOURCE_DIR}/luabind.c
    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bindgen.py $ENV{TWNROOT}/share/twn_api.json
+   CODEGEN
 )
 
 add_compile_definitions(LUA_32BITS)