[Fontations] Build bindgen targets, basic Rust test
Define meson bindgen steps that form a bindgen Rust library that allows calling back to typical FontConfig functions for constructing FcPatterns and adding them to an FcFontSet.
Add a basic Rust test that demonstrates it's possible to call back to Fontconfig. Enable execution of this test through either
-
meson test -C build
or cargo test
Part of #434.