Support for PHP7

[mikhainin]

[mikhainin]

This is a commit from our private fork, which is the same as https://github.com/tony2001/php-judy Tony used to work for our company not I'm trying to spread his work :)

We've got a couple of changes that add support for PHP 8.0 and 8.2. They are based on this and I'm going to propose them later on (once this is in master)

If you wish, I can create one single PR adding the whole bunch of changes.

Unfortunately, this also removes support for PHP 5.x but I reckon, we cannot find it in the wild nowadays.