a glaring oversight on my part

Signed-off-by: Leah Rowe <leah@libreboot.org>

script is -e anyway, so this is redundant, but best
put it here anyway. it can only help. correct behaviour
is always to fail on error, except in certain cases that
would be handled on a case-by-case basis in each script

- A spurious semicolon caused the arguments to printf in die() to be
  executed instead of printed
- ${@} in die() needs to be in quotes or else printf prints each word on
  a separate line
- The number of arguments to main() does not include main itself so it
  should be comparing against 1 instead of 2 to determine if enough
  arguments were supplied.

make blobutil a symlink. Example of command changes:

./blobutil download x220_8mb
is now:
./update blobs download x220_8mb

The old command still works, for compatibility.

Signed-off-by: Leah Rowe <leah@libreboot.org>

move resources/scripts/download/ to:
resources/scripts/update/module/

This: ./download coreboot
Is now: ./update module coreboot

However, running "./download coreboot"
still works, via backwards compatibility.

Signed-off-by: Leah Rowe <leah@libreboot.org>

unify them, by turning them into symlinks pointing
to a generic script named lbmk

the script named lbmk is a fork of the script
named "build", which just checks argument 0 and adapts
accordingly

all of these core scripts had the exact same overall
logic, and they are thus compatible

Signed-off-by: Leah Rowe <leah@libreboot.org>