time64.inc: annotate and clean up recipe-specific Y2038 exceptions

Additionally:
- drop pseudo from INSANE_SKIP for 32bit time API check
(pseudo passes the check; it's not clear where the issue may have been)

- move rust exceptions to the cargo class, as the problem
is common across the ecosystem, and needs to be fixed in the
libc crate.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>