systemd: add systemd-stage0 to provides

Oliver Smithrequested to merge
ollieparanoid/pmaports:systemd-stage0-part0 into master

Prepare to add a systemd-stage0 package that will replace the existing bootstrap logic. First we need to let systemd provide systemd-stage0 and wait until the new binary packages are built.

In follow-up patches (!6440 (merged)), a systemd-stage0 package will be introduced (that does not depend on systemd-enabled dbus or polkit). The systemd/dbus and systemd/polkit will be changed to use systemd-stage0-dev and systemd-stage0-libs as makedepends. This makes the following bootstrap work when building without a binary repository:

  1. systemd-stage0
  2. dbus
  3. polkit
  4. systemd

If we already have the binary repository, dbus and polkit will be built against systemd proper as it provides systemd-stage0 packages with this patch.

CC: @craftyguy, @jane400, @kcxt

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