FTBFS with glibc 2.34

dnsdbq is FTBFSing when compiled against glibc 2.34:

asinfo.c: In function ‘asinfo_from_dns’:
asinfo.c:194:17: error: ‘__p_rcode’ is deprecated [-Werror=deprecated-declarations]
  194 | return p_rcode(rcode);
      | ^~~~~~
In file included from asinfo.c:33:
/usr/include/resolv.h:259:17: note: declared here
  259 | const char * p_rcode (int) __THROW __RESOLV_DEPRECATED;
      | ^~~~~~~
cc1: all warnings being treated as errors

This is happening because glibc 2.34 deprecated quite a few functions from resolv.h (libresolv), according to their announcement at https://lists.gnu.org/archive/html/info-gnu/2021-08/msg00001.html:

* Various rarely-used functions declared in <resolv.h> and
  <arpa/nameser.h> have been deprecated. Applications are encouraged to
  use dedicated DNS processing libraries if applicable. For <resolv.h>,
  this affects the functions dn_count_labels, fp_nquery, fp_query,
  fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
  p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
  p_type, putlong, putshort, res_hostalias, res_isourserver,
  res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
  sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
  ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
  ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.