the way the old script worked was extremely hacky
it's cleaner just to make the user configure git
i haven't used anything from the old .gitcheck script,
which is now deleted. i completely re-wrote this, in
a much simpler way.
this is less maintenance now, when things change in
the upstream projects. coreboot makes heavy use of git
within its build system
Signed-off-by: Leah Rowe <leah@libreboot.org>