We do not need "make" dependencies for one-time builds.

This is needed to build libFLAC which uses ftello().

The `dump` command was dropped[1] in favor of other tools.

[1]: https://gitlab.freedesktop.org/pipewire/pipewire/-/commit/50bdebe4e87c5e26acf966e7207a591332e33239

systemd uses "rootprefix", not "prefix" for this value

https://github.com/systemd/systemd/blob/059b1b31ade7f1d716f56c5e6fd657ce22ce2032/src/core/systemd.pc.in#L23

See https://www.bassi.io/articles/2018/03/15/pkg-config-and-paths/

Fixes the build in nixpkgs