修订 C++ 吧吧规：追加明确无需警告的情况。

Signed-off-by: FrankHB <frankhb1989@gmail.com>
修订 C++ 吧吧规：补充决议。

Signed-off-by: FrankHB <frankhb1989@gmail.com>
Merge branch 'master' of github.com:tieba/tieba.github.com