Is there a way we could suppress a whole set of tests (matching a wildcard or regex) if the host running it has an old version of ATK?

See related bug 876355.

I thought I recalled seeing a method of disabling tests on certain bots and not others, rather than disabling based on compile-time information.

If not, our alternative is to do a runtime check - some tests would "pass" but not actually test anything, on some bots.