fix phpize using wrong paths

[henderkes]

What does this PR do?

Checklist before merging

If your PR involves the changes mentioned below and completed the action, please tick the corresponding option.
If a modification is not involved, please skip it directly.

• If you modified *.php, run composer cs-fix at local machine.
• If it's an extension or dependency update, make sure adding related extensions in src/global/test-extensions.php.
• If you changed the behavior of static-php-cli, update docs in ./docs/.
• If you updated config/xxx.json content, run bin/spc dev:sort-config xxx.

[henderkes]

stumbled across this when building xdebug for the frankenphp docs...

this would actually let "static"-php-"cli" compile dynamic extensions per the users choice as well.