Re: [PATCH v4 4/5] libgit: add higher-level libgit crate

> From: Calvin Wan <calvinwan@google.com>
> 
> Wrap `struct config_set` and a few of its associated functions in
> libgit-sys. Also introduce a higher-level "libgit" crate which provides
> a more Rust-friendly interface to config_set structs.
> 
> Co-authored-by: Josh Steadmon <steadmon@google.com>
> Signed-off-by: Calvin Wan <calvinwan@google.com>
> Signed-off-by: Josh Steadmon <steadmon@google.com>
> ---
>  .gitignore                              |  1 +
>  Makefile                                |  2 +-
>  contrib/libgit-rs/Cargo.lock            | 77 ++++++++++++++++++++
>  contrib/libgit-rs/Cargo.toml            | 15 ++++
>  contrib/libgit-rs/build.rs              |  4 ++
>  contrib/libgit-rs/libgit-sys/src/lib.rs |  4 ++
>  contrib/libgit-rs/src/lib.rs            | 95 +++++++++++++++++++++++++
>  contrib/libgit-rs/testdata/config1      |  2 +
>  contrib/libgit-rs/testdata/config2      |  2 +
>  contrib/libgit-rs/testdata/config3      |  2 +
>  10 files changed, 203 insertions(+), 1 deletion(-)
>  create mode 100644 contrib/libgit-rs/Cargo.lock
>  create mode 100644 contrib/libgit-rs/Cargo.toml
>  create mode 100644 contrib/libgit-rs/build.rs
>  create mode 100644 contrib/libgit-rs/src/lib.rs
>  create mode 100644 contrib/libgit-rs/testdata/config1
>  create mode 100644 contrib/libgit-rs/testdata/config2
>  create mode 100644 contrib/libgit-rs/testdata/config3