Fix gd build on PHP 8.5

[crazywhalecc]

What does this PR do?

PHP 8.5 has removed gd_pixelate.c, our patch needs update. (Copied from gd_config_81.w32).

Also this depends on #1041 .

We still need our own w32 because of static compilation.

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 or *.json, run them locally to ensure your changes are valid:
  • composer cs-fix
  • composer analyse
  • composer test
  • bin/spc dev:sort-config
• If it's an extension or dependency update, please ensure the following:
  • Add your test combination to src/globals/test-extensions.php.
  • If adding new or fixing bugs, add commit message containing extension test or test extensions to trigger full test suite.

[crazywhalecc]

This relates to #1041, where I mentioned that we were going to copy it anyway because the PHP code or other libraries might depend on the old name, so let's leave it at that.

[henderkes]

needs zlib fix first