[php-src] Issue #21209: Uncomment `extension_dir` in Windows releases by default in php.ini example files

[email protected] (mvorisek)
Newsgroups php.bugs
Message-ID <[email protected]> 
Issue: https://github.com/php/php-src/issues/21209
Author: mvorisek

### Description

<img width="745" height="95" alt="Image" src="https://github.com/user-attachments/assets/312e06d1-b13d-46e2-9db1-5ccbb532081d" />

This step is needed after download from https://windows.php.net/download/ in order to make the packed extensions to work.

Both production/development distributed php.ini files should have this option uncommented by default.
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