ldns: Update to 1.9.0

Merge commit '5eb18e8576462f5bb33fbd60fcbd752fe5791f33'

MFC after: 1 week
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D57170

(cherry picked from commit 9ed998a81bab54203604d08293089db875758686)

ldns: Regenerate configuration after update

MFC after: 1 week
Fixes: d44c9549ef31 ("ldns: Update to 1.8.4")
Fixes: 9ed998a81bab ("ldns: Update to 1.9.0")

(cherry picked from commit 70739f3499b03cfff6bdd985db0d81cde76be15a)

ldns: Fix unused variable on big-endian

MFC after: 1 week
Fixes: 9ed998a81bab ("ldns: Update to 1.9.0")

(cherry picked from commit dd64155367840a3747d812577457a7ed7c8e9acb)