meta: Drop useless class

This class was added by me back in 2007 and has changed one for a whitespace issue
since. It only has two lines and neither are particularly useful, one was replaced
by the nopackages class, the other adding recursive dependencies also is now
mainly problematic adding tons of unneeded dependencies. The name is hard to
understand and the class doesn't have a clear purpose. Drop it.

Remove the references in devtool (which may be the one reason to keep it around
but in my view still not worth it).

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>