[Gnu-efi-discuss] make: Fix shell exit status handling

[Richard H. <hug...@gm...>]

Right now whenever we have shell commands with loops, errors in the
middle are accidentally ignored, and make continues to process commands.

This adds "set -e" to all of those, so they'll propagate back up.

Signed-off-by: Peter Jones <pj...@re...>

Original patch is by Peter Jones, lightly modified by me to apply to master.

Richard