Let's not call ares_save_options() deprecated just yet

   ares_set_*() options and the ares_init_options() function will become

   deprecated.

   ares_save_options() is considered deprecated as of right now. Use ares_dup()

   instead!

   So, if new options are added they are not added to this struct. And they

   are not "saved" with the ares_save_options() function but instead we

   encourage the use of the ares_dup() function. Needless to say, if you add

   config options to c-ares you need to make sure ares_dup() duplicates this

   new option.

   When new options are added to c-ares, they are not added to this

   struct. And they are not "saved" with the ares_save_options() function but

   instead we encourage the use of the ares_dup() function. Needless to say,

   if you add config options to c-ares you need to make sure ares_dup()

   duplicates this new option.

 */

struct ares_options {