[codex] fix php freetype paths

[Aoody743]

What changed

• Unified old PHP GD builds to always resolve a usable freetype directory instead of skipping it when pkg-config can see freetype2.
• Fixed the old PHP 5.2-5.7 install scripts so their Darwin freetype path matches the freetype_old build they rely on.
• Updated the PHP 5.2 GD extension installer to use the same fallback logic as the shared old-GD path.

Why

• On clean Debian 12 installs, PHP 5.6 could build GD without freetype support, which breaks captcha image rendering.
• Some older install scripts also pointed at lib/freetype while building or installing freetype_old, which made the old toolchain inconsistent.

Validation

• Ran bash -n on every modified shell script.