[OE-core] [PATCH 21/26] systemd: remove PV from the recipe

[Pascal Bach]

> The idea behind systemd-stable repository is described here:
> http://www.freedesktop.org/wiki/Software/systemd/Backports/
>
Thanks I didn't know that.

> However, it hasn't received any new commits since early May, and still stuck at v219, so should we update to a new version from the main repository? What's oe-core policy here?
>
Not sure what would be the right appreoach, I would also be interested to hear the policy of oe-core for this.

Pascal