rpm-ostree

Split cbindgen to separate build, support external version The problem is building bindgen as part of our single run locks serde to way old versions, and I want to use newer versions. Since Fedora will now again ship a `cbindgen` package, let's also support using it if we find it, saving ourselves the cost of building it. For distros that don't ship it (e.g. CentOS) for CI purposes we build it. For downstream builds that are offline, rather than vendor the cbindgen sources like we do with our main Rust, let's just vendor the `rpmostree-rust.h` file as was suggested in https://bugzilla.redhat.com/show_bug.cgi?id=1608670 Closes: https://github.com/projectatomic/rpm-ostree/issues/1557 Closes: #1573 Approved by: jlebon 2018-09-22 01:02:18 +03:00			`Cargo.lock`
			`target`