190149 – Missing dependency for dns/dnsmasq with DNSSEC

cc  -o dnsmasq cache.o rfc1035.o util.o option.o forward.o network.o  dnsmasq.o dhcp.o lease.o rfc2131.o netlink.o dbus.o bpf.o  helper.o tftp.o log.o conntrack.o dhcp6.o rfc3315.o  dhcp-common.o outpacket.o radv.o slaac.o auth.o ipset.o  domain.o dnssec.o blockdata.o -lgmp -L/usr/local/lib  
dnssec.o: In function `dnssec_validate_by_ds':
dnssec.c:(.text+0x290): undefined reference to `nettle_hashes'
dnssec.c:(.text+0x29f): undefined reference to `nettle_hashes'
dnssec.c:(.text+0x2ac): undefined reference to `nettle_hashes'
dnssec.o: In function `validate_rrset':
dnssec.c:(.text+0x1253): undefined reference to `nettle_hashes'
dnssec.c:(.text+0x14c3): undefined reference to `nettle_hashes'
dnssec.o:dnssec.c:(.text+0x308c): more undefined references to `nettle_hashes' follow
dnssec.o: In function `verify':
dnssec.c:(.text+0x45fd): undefined reference to `nettle_rsa_public_key_init'
dnssec.c:(.text+0x4699): undefined reference to `nettle_dsa_public_key_init'
dnssec.c:(.text+0x46a6): undefined reference to `nettle_dsa_signature_init'
dnssec.c:(.text+0x4888): undefined reference to `nettle_dsa_sha1_verify_digest'
dnssec.c:(.text+0x48c8): undefined reference to `nettle_dsa_signature_init'
dnssec.c:(.text+0x491f): undefined reference to `nettle_secp_384r1'
dnssec.c:(.text+0x4964): undefined reference to `nettle_secp_256r1'
dnssec.c:(.text+0x4969): undefined reference to `nettle_ecc_point_init'
dnssec.c:(.text+0x4a22): undefined reference to `nettle_ecc_point_set'
dnssec.c:(.text+0x4abb): undefined reference to `nettle_ecdsa_verify'
dnssec.c:(.text+0x4bbf): undefined reference to `nettle_rsa_sha1_verify_digest'
dnssec.c:(.text+0x4be7): undefined reference to `nettle_rsa_md5_verify_digest'
dnssec.c:(.text+0x4c05): undefined reference to `nettle_rsa_sha256_verify_digest'
dnssec.c:(.text+0x4c23): undefined reference to `nettle_rsa_sha512_verify_digest'
cc: error: linker command failed with exit code 1 (use -v to see invocation)
*** Error code 1

Fix: 

Add dependency on security/nettle.
How-To-Repeat: Build this port in a clean room environment.