trivial: Hardcode the AppStream-glib version
trivial: Hardcode the AppStream-glib version

This is the version we've imported from, which allows cabinet files requiring a
specific version of this library to continue working.

fwupd/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,vathpela/fwupd,hughsie/fwupd,vathpela/fwupd,vathpela/fwupd,hughsie/fwupd,vathpela/fwupd