In the fpi_print_fill_from_user_id() GDate is defined using
g_autoptr(). However, this requires new enough GLib. For older
versions there's a definition provided locally in fpi-compact.h.
Include the file to fix build with older version of GLib.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
We prefixed them with fp- which is not as obvious as fpi-. Also,
explicitly mark them as private and to be skipped in the GObject
Introspection annotatinos.
Warning: FPrint: (Signal)fp-image-device-state-changed: argument object: Unresolved type: 'FpiImageDeviceState'
