Jristz [1] filed a orphan request for xdelta [2]:
Maintainer fal to se coments about the glib issue, also fail to track
glib movements (glib is makedeps since forever and he never add it to
the makedep)
so I think someone could do a better job or at less update acordly
better.
[1] https://aur.archlinux.org/account/Jristz/
[2] https://aur.archlinux.org/pkgbase/xdelta/