[CMake/CI] Use config_info.cpp for cmake self test

test/CMakeLists.txt

@@ -11,6 +11,6 @@ project( BoostPreprocessorCMakeSelfTest )
 
 add_subdirectory( .. ${CMAKE_CURRENT_BINARY_DIR}/boost_preprocessor )
 
-add_executable( boost_preprocessor_cmake_self_test cmake_self_test.cpp )
+add_executable( boost_preprocessor_cmake_self_test config_info.cpp )
 target_link_libraries( boost_preprocessor_cmake_self_test Boost::preprocessor )
 

test/cmake_self_test.cpp

@@ -1,3 +0,0 @@
-#include <boost/preprocessor.hpp>
-
-int main() {}