ostbuild: Don't run fakeroot if we are root
ostbuild: Don't run fakeroot if we are root

For efficiency reasons, as well as a quick shortcut to avoid pulling
fakeroot into the gnomeos yocto layer.

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