Parsing utilities for the build and test phases of the jmdict crate.
This code is in a separate crate because, if we put it in the jmdict crate itself, its build.rs
could not import it.
There is none. Although this crate is published on crates.io for technical reasons, this crate
is internal to the jmdict crate. Its API may change at any time, including in bugfix releases. Use
the API provided by the jmdict crate instead.