There were some changes to the sys API for introspection fixes.
And add a feature for the current release, which is something
I'll add to the checklist for releases.
Fix up the paths for the crates now that the Rust bindings are in
`rust/`.
We can't today include the test suite because it depends on `ostree-rs-ext`
which would make everything circular.
(Building that now requires a separate `cd tests/inst && cargo build`)
rust-analyzer is happier with this because it understands
the project structure out of the box.
We aren't actually again adding a dependency on Rust/cargo in the core,
this is only used to make `cargo build` work out of the box to build
the Rust test code.
Colin Walters