insane: native-last: Only print classes inherited after native/nativesdk

For usability, only print the classes inherited after native/nativesdk
which makes it easier for the user to see where the problem is.

Realted to [YOCTO #5729].

Signed-off-by: Tomasz Dziendzielski <tomasz.dziendzielski@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>