Fix bug #81618: Correct dns_get_record on FreeBSD

Modify dns_get_record to test for records result based on dns_errno to
accommodate modern FreeBSD, for which res_nsearch() does not upda

Fix bug #81618: Correct dns_get_record on FreeBSD

Modify dns_get_record to test for records result based on dns_errno to
accommodate modern FreeBSD, for which res_nsearch() does not update
h_errno directly. Add new php_dns_errno macro, and have it consult
statp->res_h_errno when OS has res_nsearch().

Closes GH-7655.

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