Remove build-time dependency on libdbus
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build: Remove redundant computation of dbus data directory
We were asking pkg-config "if I define ${datadir} to pk_prefix/pk_datadir, what would ${datadir} be?" but the answer is obviously always going to be pk_prefix/pk_datadir.
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build: Don't require dbus development files
We don't actually need libdbus, only the dbus-daemon's installation directory for system services, which in practice is always going to be /usr/share/dbus-1/system-services.