Require ostree 2017.15 for ostree_repo_fsck_object().
Require ostree 2017.15 for ostree_repo_fsck_object().

Closes: #1739
Approved by: alexlarsson

flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak