* nscd/aicache.c: Prefer using gethostbyname3_r NSS callback to also
get ttl and canonical name. Use these two values.
* resolv/Versions: Export _nss_dns_gethostbyname3_r from libnss_dns.
* resolv/nss_dns/dns-host.c (getanswer_r): Take two new parameters.
If nonnull fill with TTL and pointer to canonical name respectively.
(_nss_dns_gethostbyaddr_r): Pass NULL in new parameters of getanswer_r.
(_nss_dns_gethostbyname2_r): Just wrapper around
_nss_dns_gethostbyname3_r.
(_nss_dns_gethostbyname3_r): Renamed from _nss_dns_gethostbyname2_r.
Take two new parameters which as passed to getanswer_r.