cmake HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID examples

fluent/fluent-bit lib/c-ares-1.34.4/CMakeLists.txt :409

CHECK_STRUCT_HAS_MEMBER("struct sockaddr_in6" sin6_scope_id "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID LANGUAGE C)