collectd: enable a bunch of plugins (by adding more deps)

These are plugins that are internal to collectd; they are bundled in the
source archive. Without this, none(?) of the collectd plugins advertised
on the homepage actually work, so I think we should add this.

This change increases the closure size from 129 MiB to 546 MiB. The size
of the collectd store path itself goes from 2 MiB to 2.6 MiB.

Users wanting a smaller closure size can easily set some (or all) of the
optional inputs to "null" using ".override".