libdecor Headers for Rust

This library contains minimalist Rust FFI bindings for libdecor in a way that's roughly equivalent to the official libdecor.h for C/C++. It makes no attempt at providing safe or idiomatic Rust wrappers and doesn't rename any C identifiers to match Rust's style guidelines.

The following Rust code:

use libdecor_headers::libdecor::*;

is roughly equivalent to the following C code:

#include <libdecor.h>

This library is based specifically on libdecor 0.2.2 since that's the version provided by Steam Runtime 3 'sniper'.

Using this library does not automatically link against libdecor-0.so.