[PKG-OpenRC-Debian] Bug#763681: not a regression

[Adam Borowski]

Control: severity -1 important

As openrc has never been built on these architectures, technically the
proper severity here is wishlist rather than serious, as the package "needs
porting".  For example, systemd does FTBFS on kfreebsd-* too.

In this case, though, this rule feels more like a technicality rather than
intention, I'm setting the severity to "important" instead.