many places in lbmk used err, because older versions
of x_ did not handle globbing properly.
however, use of x_ is preferable on trivial commands.
the only time err() should be called is what it has
to be, when x_ can't work, or when a more useful error
message is needed, for context.
Signed-off-by: Leah Rowe <leah@libreboot.org>
The idea with mk is that it's meant to basically be a
stub for running everything else, while mainly having
the trees logic within it (what was once script/trees).
Signed-off-by: Leah Rowe <leah@libreboot.org>