gnu/packages/gnome.scm (gnome-online-accounts)[outputs]: Add 'lib'.
[arguments]: Set the 'libdir' path to the 'out' output, and add a phase
to ensure that libgoa gets installed in the 'lib' output.
(evolution-data-server, gfbgraph, gnome-calendar, gnome-control-center,
gnome-todo, libgdata, libzapojit): Use the 'lib' output of
gnome-online-accounts.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>