Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Don't cast away the const qualifier. Fixes gcc build.

ldns_axfr_abort is apparently an undocumented API function. Unstaticize
and add a prototype + documentation to the relevant header.

MFV: nuke autprops

Upgrade to latest ldns (1.6.17) and unbound (1.4.22).

MFC after: 3 weeks

Remove duplicate function declaration.

Approved by: re (blanket)

The Unbound developers have never met a pointer game they didn't like.
Fix needless deconsting.

Approved by: re (blanket)

Clean up the ntop / pton code. Part of a patch which has been submitted
upstream but not yet adopted.

Last remaining prototype issue that still hasn't been fixed upstream.

Upgrade to 1.6.16

Add generated files

Import LDNS and build it as an internal library.

import ldns 1.6.13