autogen: Use set -e so we actually error out on failure
autogen: Use set -e so we actually error out on failure

Such as not having submodules set up.

vrutkovs/vrutkovs.github.io,djdeath/gnome-ostree,chergert/gnome-continuous,GNOME/gnome-ostree,djdeath/gnome-ostree,chergert/gnome-continuous,GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io,vrutkovs/vrutkovs.github.io,chergert/gnome-continuous,djdeath/gnome-ostree,GNOME/gnome-ostree