gthreadedresolver: Don’t warn on unrecognised record types

Otherwise the code isn’t forwards-compatible, and may be DOSed by
servers returning unknown records, if `G_DEBUG=fatal-warnings` is
enabled for some reason.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

gio/gthreadedresolver.c

@@ -780,7 +780,7 @@ g_resolver_records_from_res_query (const gchar      *rrname,
           record = parse_res_txt (answer, p + rdlength, &p);
           break;
         default:
-          g_warn_if_reached ();
+          g_debug ("Unrecognised DNS record type %u", rrtype);
           record = NULL;
           break;
         }