Allow to build gnome-todo without libportal
I'm trying to build whole GNOME without flatpaks.
In most of the cases libportal is used to open files and as gtk provides native file chooser building with libportal is a bit pointless. It would be good to have possibility to build gnome-todo without libportal or at least without the background
plugin (so far gnome-todo is only package which now is not possible to build without libportal).
Edited by Andre Klapper