DANE support for Wget2

[Tim Rühsen]

For the interested people, DANE support has been merged today (with 
GnuTLS build only).

DANE allows to verify the server certificates for HTTPS connections via 
DNS. This allows to connect to servers without having a CA certificate 
pool installed - well, *if* the the site admin prepared the DNS entry 
for DANE (with so called TLSA records).

WARNING: Without DNSSEC, MITM attacks can't be detected when using DANE.

DANE is still an experimental feature and needs to be enabled via
the `--dane` CLI option.

Have fun playing with it.
Any feedback is highly appreciated.

See also
https://en.wikipedia.org/wiki/DNS-based_Authentication_of_Named_Entities
https://gitlab.com/gnuwget/wget2/-/issues/627
https://gitlab.com/gnuwget/wget2/-/merge_requests/522

Regards, Tim

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