This way we can add other checks and only run a subset of all the
checks. The default remains to run all the checks.
I made separate options for API and ABI, but since we use the same
tool for both and it doesn't have an obvious way to check only API or
only ABI, the two options must be both enabled or both disabled.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>