ipv4 quadonly, make test program compile

[adns] / regress / case-timeout.out

adns debug: using nameserver 172.18.45.36
chiark.greenend.org.uk flags 0 type 1 A(-) submitted
chiark.greenend.org.uk flags 0 type A(-): DNS query timed out; nrrs=0; cname=$; owner=$; ttl=604770
rc=0