[dns-operations] HTTPS record support

[Florian Weimer]

* Mark Andrews:

> Well the structure was designed to be extensible. Those are the
> minimum elements the structure has to contain.  If you are looking
> for ABI compliance you would add new stuff at the end.  I would also
> add flags to signal that SRV, HTTPS, etc. should be looked up.  That
> change has to be requested by the application.
>
> This should go through the IETF and then POSIX.  I believe that was
> the original path getaddrinfo took.

Does the IETF do API design?  I thought that getaddrinfo was very much
an outlier.