Expand description
Convenience wrappers for cargo buildscript input/output.
§Example
build::rerun_if_changed("build.rs"); // only rerun for buildscript changes
build::rustc_cfg("has_buildrs"); // set #[cfg(has_buildrs)]
dbg!(build::cargo()); // path to the cargo executable
dbg!(build::cargo_manifest_dir()); // the directory of the build manifest