By the time we get informed that there's an LFS reload we've already
opened all the user libraries as well, so it's not safe to simply redo
that with a new lua_State. Currently that results in a hang, and a
manual reset is required to progress. Doing the automatic restart is
the correct approach here, even though this adds another reboot to the
LFS reload process.
Also fixed up a couple of minor issues when embedded-LFS is used.
a3212b29ac