Merge pull request #41 from Hailios/remove_duplicate_cmake

remove duplicate line in cmake

Author: mzimbres

CMakeLists.txt

@@ -102,7 +102,6 @@ endif()
 add_executable(cpp17_intro_sync examples/cpp17_intro_sync.cpp)
 target_compile_features(cpp17_intro_sync PUBLIC cxx_std_17)
 add_test(cpp17_intro_sync cpp17_intro_sync)
-add_test(cpp17_intro_sync cpp17_intro_sync)
 if (MSVC)
     target_compile_options(cpp17_intro_sync PRIVATE /bigobj)
     target_compile_definitions(cpp17_intro_sync PRIVATE _WIN32_WINNT=0x0601)