in the future, we may start downloading files that aren't
blobs, such as mxm port configs (on mainboards that use
MXM graphics)

this directory will contain all of those files

generally change the language used, across lbmk, to make
use of "vendorfile" instead of "blob"

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

mrc.bin is now handled by include/mrc.sh, adapted
from now-deleted script/update/blobs/mrc

much of the logic has been re-written or adapted for
inside script/update/blobs/download

mrc links/hashes now defined in config/blobs/sources

the new code is simpler (and smaller). in addition,
lbmk can now easily handle mrc.bin files for other
platforms such as broadwell. watch this space.

the full .zip download is now cached, like with other
vendor downloads. this means it won't be re-downloaded
if it was already downloaded before.

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

some files did not have backup links defined (the ones
defined were the same as main links)

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

sha-1 has known collision issues, which may not be readily
exploitable yet (in our context), but we should ideally use
a more secure method for checking file integrity.

therefore, use sha-2 (sha512sum) for checking files. this is
slower than sha-1, but checksum verification is only a minor
part of what lbmk does, so the overall effect on build times
is quite negligible.

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

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

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