If the mode string is empty, then it's a build command.

See commit:

commit b1ea4165754f04660d3c7282274c4b12355f88a0
Author: Leah Rowe <leah@libreboot.org>
Date:   Wed Apr 23 03:54:08 2025 +0100

    mk: remove mkhelp() and use x_() instead

This commit removed the following check:

If mode isn't set, run an mkhelper, otherwise don't.

Because this simplification removed that behaviour,
running e.g. "./mk -m coreboot x200_8mb" would result
in the mkcorebootbin function being executed, which is
normally putting the coreboot rom together.

Since it wasn't built in this case, an error is thrown.
This change therefore restores the previous behaviour,
fixing the bug.

First reported in this error report:
https://codeberg.org/libreboot/lbmk/issues/306

This commit fixes the issue.

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

i prefer it this way. this reverses the change that
i made a few revisions ago

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

now that main is so small, some of the condensed
lines can be loosened up.

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

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

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

this matches cbmk, where inject.sh is the file name

this will make future cherry-picks of lbmk->cbmk easier

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

move non-init functions to lib.sh

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

this is in prep for the next change, where non-init
functions will be moved to another file, again named
include/lib.sh

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

this was used alongside the xgcc linking, so that coreboot
trees could specify that another tree was to be downloaded.

since this variable will no longer be used, it should be
removed, to avoid dead code bloat.

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

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