Broken docs building
We broke the documentation building during the port to meson:
ERROR: Error in gtkdoc helper script:
ERROR: ['/home/hadess/Projects/gnome-install/bin/gtkdoc-mkhtml', '--path=/home/hadess/Projects/jhbuild/fprintd/doc:/home/hadess/.cache/jhbuild/build/fprintd/doc', 'fprintd', '../fprintd-docs.xml'] failed with status 6
warning: failed to load external entity "../dbus/net.reactivated.Fprint.Manager.ref.xml"
../fprintd-docs.xml:66: element include: XInclude error : could not load ../dbus/net.reactivated.Fprint.Manager.ref.xml, and no fallback was found
warning: failed to load external entity "../dbus/net.reactivated.Fprint.Device.ref.xml"
../fprintd-docs.xml:67: element include: XInclude error : could not load ../dbus/net.reactivated.Fprint.Device.ref.xml, and no fallback was found
warning: failed to load external entity "../../COPYING"
!38 (merged) has a patch that enables gtk-doc building.