dns_check_record() always return true on Alpinelinux #78008

[andypost]

Ref https://bugs.php.net/bug.php?id=78008

• free handle before return result
• cleaned up remaining usage of MAXPACKET
• update dns_get_mx() to use the same type

[andypost]

AppVeyor failed test is unrelated

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

[ekinhbayar]

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

[andypost]

@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) {
}

[andypost]

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

[ekinhbayar]

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