Description:
------------
dns_get_record() allows retrieving one or multiple DNS records of one or multiple types.

When requesting for DNS_A + DNS_AAAA records but only A records are available, then only A records are returned, except on BSD where instead an error is returned.

PHP will check h_errno for error, however it seems that FreeBSD 10.x or res_nsearch() will not update this value, and will instead update res_h_errno in the handle.

In ext/standard/dns.c after the call to php_dns_search() I have added this debug line:
fprintf(stderr, "n=%d h_errno=%d statp->res_h_errno=%d\n", n, h_errno, handle->res_h_errno);

The result when running the test script below was:

n=53 h_errno=0 statp->res_h_errno=1
n=-1 h_errno=0 statp->res_h_errno=4

So we could when HAVE_RES_NSEARCH is defined do the switch not on h_errno, but handle->res_h_errno.

Test script:
---------------
var_dump(dns_get_record("www.asahi-net.or.jp", DNS_A + DNS_AAAA));


Expected result:
----------------
array(1) {
  [0]=>
  array(5) {
    ["host"]=>
    string(19) "www.asahi-net.or.jp"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(40667)
    ["type"]=>
    string(1) "A"
    ["ip"]=>
    string(13) "202.224.39.34"
  }
}

Actual result:
--------------
Warning: dns_get_record(): DNS Query failed in test.php on line 2
bool(false)