Bug#940634: ibus: FTBFS: emojier.vala:915.48-915.53: error: Assignment: Cannot convert from `GLib.SList' to `GLib.SList?'

[Changwoo Ryu]

Control: tags -1 + fixed-upstream

It's been fixed in upstream 1.5.20 or later.

Maybe we can just upload 1.5.21-1~exp2 in experimental to unstable.