Before this change, systemd package depends on other compression
libraries, but does not depend on libbz2. Let's also make it depend
on libbz2.
This also makes bzip2-dev explicitly installed on build, like other
compression libraries like lz4-dev, xz-dev, zlib-dev, and zstd-dev.
Currently, it is indirectly installed as glib-dev depends on it.
So the makedepends= change does not effectively changes anything.
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8926>
Yu Watanabe
5ff3f5ed44