update/trees: support custom make/autogen argument

this is now used in grub, for the FS_PAYLOAD_MODULES
option in the make command

lbmk should generalise as much logic as possible. in
some parts of it, logic is hurrently hardcoded, specific
to a given project that lbmk uses, but lbmk is essentially
a source-based package manager, like what you might find
on a small linux distro, so we need to try to
be as generic as possible.

lbmk is the "build system of build systems", so it has to
work generically with as many of them as possible

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

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