Bug#868418: Raising severity to serious for select libgnome rdepends

[Jeremy Bicha]

Control: severity -1 serious

These 2 packages, alleyoop and gnome-hearts, also depend on the
deprecated libgnome (and related) libraries. [1] I don't think there
is much interest in the Debian GNOME team for these packages.
Therefore, I'm raising the bug severity to let them be auto-removed
from testing. If there are no objections, I'll file RM bugs after
that.

[1] https://lists.debian.org/debian-devel/2017/10/msg00299.html

Thanks,
Jeremy Bicha