stream test breaks PHP7 windows builds

[codemasher]

https://github.com/codemasher/php-ext-xz/actions/runs/3214966573
paging you @remicollet as you introduced the offending test in #5 :)

there's even a broken PHP8 test here:
https://github.com/codemasher/php-ext-xz/actions/runs/3214966574/jobs/5255730291

[codemasher]

When i run the test locally, i get a zend_mm_heap corrupted - hope this is of any use.

[remicollet]

Sorry, I cannot reproduce on Linux (and don't have any idea about how Windows works)

[codemasher]

Aw that's too bad :(
Hoping for someone who can look into this or even adopt it though, as my knowledge of PHP internals is very limited.