* Remove the `sys-info` crate
It offers much more features than we currently use.
Additionally, it was preventing me to cross-compile for NetBSD.
Since we were just using the `hostname()` function from the crate,
I went ahead and stole it.
* Add NetBSD target
* Fix FreeBSD clippy warnings
* Bump minimum Rust version to 1.60
As required by the `time` crate (`notify-rust` > `mac-notification-sys` > `time`).
* Simplify CI
Changes:
- Bump `actions/checkout` to v3, fixing a bunch of warnings.
- Replace unmaintained `actions-rs/cargo` by `dtolnay/rust-toolchain`.
- Run Rustfmt only once.
- Add support for cached dependencies (via `Swatinem/rust-cache`).
* Add Android target
Use the awesome `cross` tool for cross-compiling!
* Add FreeBSD target
