libotutil: Drop dead prototype
libotutil: Drop dead prototype

Was never implemented.

gatispaeglis/ostree,resin-io/ostree,leandrosansilva/ostree,GNOME/ostree,sujitfulse/ostree,leandrosansilva/ostree,GNOME/ostree,sujitfulse/ostree,resin-io/ostree,sujitfulse/ostree,gatispaeglis/ostree,gatispaeglis/ostree,gatispaeglis/ostree,resin-io/ostree,gatispaeglis/ostree,leandrosansilva/ostree,leandrosansilva/ostree,leandrosansilva/ostree,resin-io/ostree,sujitfulse/ostree,gatispaeglis/ostree,GNOME/ostree,resin-io/ostree,GNOME/ostree,sujitfulse/ostree,GNOME/ostree