dns: use undeprecated c-ares APIs #2200
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c-ares marked some APIs deprecated in 1.28.1.
in this change, we conditionally use the undeprecated APIs when they are available. please note, we don't specify the minimal supported c-ares version in our building system.
in which, ares_fds() and ares_process() are not changed yet, because we need to change the way how to poll the events for name resolution. this would need more thoughts before moving forward.
Refs #2197
Signed-off-by: Kefu Chai [email protected]