Function build::output::rerun_if_env_changed

pub fn rerun_if_env_changed(name: impl AsRef<OsStr>)

The rerun-if-env-changed instruction tells Cargo to re-run the build script if the value of an environment variable of the given name has changed.

Note that the environment variables here are intended for global environment variables like CC and such, it is not necessary to use this for environment variables like TARGET that Cargo sets.