Broken build on PHP 8.0.x

[marekskopal]

Hi,

After changes from this pull request #498 build on PHP 8.0.x is broken.

If I revert those changes, build works fine.

On 8.1.x its fine too.

I suppose that zend_is_graceful_exit is not present in 8.0

[marekskopal]

I created a pull request that should fix it #503

[stesie]

PR's merged. Thanks for pointing this out 👍