sync to libunbound 1.16.2; heavy lifting by sthen

sync to unbound 1.13.2
OK sthen

Update to libunbound 1.10.0
Heavy lifting by sthen in unbound(8)
Tested by benno and matthieu

Update to libunbound 1.9.6
Heavy lifting by sthen with updating in-tree unbound(8).

Import bits from (lib)unbound that we need for unwind(8).

This is probably too much but allows us to keep in sync with
usr.sbin/unbound to be able to easily apply updates.

sync to unbound 1.13.2
OK sthen

Update to libunbound 1.10.0
Heavy lifting by sthen in unbound(8)
Tested by benno and matthieu

Update to libunbound 1.9.6
Heavy lifting by sthen with updating in-tree unbound(8).

Import bits from (lib)unbound that we need for unwind(8).

This is probably too much but allows us to keep in sync with
usr.sbin/unbound to be able to easily apply updates.

Update to libunbound 1.10.0
Heavy lifting by sthen in unbound(8)
Tested by benno and matthieu

Update to libunbound 1.9.6
Heavy lifting by sthen with updating in-tree unbound(8).

Import bits from (lib)unbound that we need for unwind(8).

This is probably too much but allows us to keep in sync with
usr.sbin/unbound to be able to easily apply updates.

Update to libunbound 1.9.6
Heavy lifting by sthen with updating in-tree unbound(8).

Import bits from (lib)unbound that we need for unwind(8).

This is probably too much but allows us to keep in sync with
usr.sbin/unbound to be able to easily apply updates.