Dependency cleanup:
Remove libgnomeui, not used since 2012, see
http://svn.gnucash.org/trac/changeset/22379/
Add libgnomecanvas and some other indirect dependencies.
Add gnome-keyring dependency. It is optional, but I found no way to disable
it when it's installed, so depend on it for now, to avoid surprises.

Bump PKGREVISION.

(wiz)