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

Approved by:	re (blanket)
Remove duplicate function declaration.

Approved by:	re (blanket)
Move libldns to the correct (ordered) library list.

Approved by:	re (blanket)
Set NO_WERROR for unbound until I can figure out how to unbreak the
non-clang build.

Approved by:	re (blanket)