Low-level unsafe FFI bindings for zbq.h.
zbq is a Linux-specific single-producer / multi-consumer (SPMC) shared-memory
ring-buffer with optional file-descriptor passing.
This crate compiles zbq.h (by defining ZBQ_IMPLEMENTATION) via the cc
build-dependency and exposes the raw C symbols through extern "C" blocks.
For safe, idiomatic Rust wrappers see the zbq crate.