libgpod (local Homebrew formula)

Homebrew core does not currently ship libgpod, but Strawberry can optionally use it to support classic iPod devices (via libgpod-1.0 + gdk-pixbuf-2.0).

This formula is pinned to a known-good upstream snapshot and disables Linux-specific integration (udev/HAL) and language bindings to keep the build reliable on macOS.