static_holmes is a fork of the charlock_holmes gem with a single
change to make it possible to statically link icu4c libraries via the
`--enable-static` config option:
https://gitlab.com/gitlab-org/ruby/gems/charlock_holmes/-/merge_requests/2

For macOS users, whenever Homebrew updates icu4c, charlock_holmes gem
stops working because the old dynamically linked library is
removed. With this change, those upgrade problems will go away.

Note that `--enable-static` only works on macOS. Ubuntu Linux doesn't
compile the static library with position-independent code (`-fPIC`),
so link errors result if `--enable-static` is used.

Relates to
https://gitlab.com/gitlab-org/gitlab-development-kit/-/issues/2062

Changelog: changed