this means coreboot can now be distcleaned safely,
before and after each build of a rom image

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

fixes ./build boot roms all

in detect_firmware(), "set" is used to get values from
configs, to know if things like ME/MRC are needed

on some "board" configs under resources/coreboot/, no
actual coreboot configs are provided, because they are
used as a reference (coreboot revision, tree name etc)
for actual boards, with actual coreboot configs

when attempting to build for such a board, running "set"
on such non-existent files would cause a non-zero exit,
when we want zero. the non-zero exit then caused the
build/boot/roms command to fail, when running "all" if
it found, for example, resources/coreboot/cros/ which
has the above problem, in this context

work around it by verifying that coreboot configs exist
for the given target name, in the blobutil download script.
if no such configs exist, then exit zero (success)

doing so is correct, because the script is intended to
do just that, erroring only if it is detected that blobs
are needed for a given board, but other errors occur; if
no coreboot configs exist, then no roms will be built and,
therefore, no blobs are needed

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

Since many boards use the same ME firmware, we could save
everyone's bandwidth and time by caching the update files.

Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>

This reverts commit a4ea2867319471d9fe7d4ee540881e0286b4d3cf.

The licensing audit has been abandoned. I will not be re-licensing
in bulk to MIT.

I can still use MIT license on new works, e.g. utilities, but there's
really no pressing need to re-license lbmk. It's just shell scripts,
and most of what it interacts with (coreboot, grub, seabios) is GPL
anyway.

So who cares?

Ferass's patch was removed due to refusal to re-license, but the
decision to re-license has been canceled.

I'm now aiming for a quick stable release.

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>