Remove declaration for nonexistent function knot_edns_has_nsid()
Hi,
The knot_edns_has_nsid()
function was removed in commit https://gitlab.labs.nic.cz/labs/knot/commit/c3c124f1a88ab809e951f0bd6588bd02015f4eba, but the declaration for this function is still present in the header file: https://gitlab.labs.nic.cz/labs/knot/blob/46e4e14c23c23e18b70b555ffeb8378650eae003/src/libknot/rrtype/opt.h#L347.