It is useful to be able to build only some of the commits in a branch. Add
support for the -c option to allow this. It was previously parsed by
buildman but not implemented.
Suggested-by: NYork Sun <yorksun@freescale.com>
Signed-off-by: NSimon Glass <sjg@chromium.org>
Acked-by: NYork Sun <yorksun@freescale.com>