AppVeyor failed test is unrelated

FAILED TEST SUMMARY
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Bug #79828: Segfault when trying to access non-existing variable [C:\projects\php-src\Zend\tests\bug79828.phpt]

Hi o/ I've recently filed this bug report that is related to this PR. TL;DR is getmxrr seems to be still failing on our alpine based 7.4.9 pipelines. Notes from the quick discussion about this:
Nikita: Hm, looks like the function returns true for ancount==0

@ekinhbayar Confirm that, when domain is wrong it still returns TRUE

$ php8 -r '$a=[];var_dump(dns_get_mx("gmail.com.aaaa", $a));var_dump($a);'
bool(true)
array(0) {
}

that's because dns reports success but empty check is wrong

Hi @andypost, for your information, Nikita recently commited a change for this, though I couldn't find the chance to test it yet.