[gnome-software] (6 commits) Non-fast-forward update to branch wip/mak/libas

[Matthias Klumpp <mak src gnome org>]

The branch 'wip/mak/libas' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  308da40... Port to appstream
  4a3e178... Delete defunct remnants of shell-extension support
  4234db0... Use separate enum for OS update pseudo-apps
  1e5da2c... Replace AS_URL_KIND_MISSING with explicit property
  4eb8a42... trivial: Suggest using appstreamcli for NEWS/validate
  525676d... hack: Make CI work (temporary commit)

Commits added to the branch:

  6ec69eb... Port to appstream
  bd70a61... Delete defunct remnants of shell-extension support
  70adead... Use separate enum for OS update pseudo-apps
  68f448f... Replace AS_URL_KIND_MISSING with explicit property
  b65e218... trivial: Suggest using appstreamcli for NEWS/validate
  94ea80a... hack: Make CI work (temporary commit)