QEMU Full System Example Fuzzers Are Broken

[riesentoaster]

qemu_linux_system and qemu_linux_process throw an error on cargo make build.

• For qemu_linux_system, the import path to other repo parts are broken.
• For both, I think some of the features are messed up.
• Other things may be broken as well.

Whoever fixes this: Consider replacing all #[allow(…)] calls with #[expect(…)] like in #2784.

[riesentoaster]

Also: Consider adding them to the CI, so this doesn't happen again.

[rmalmain]

yeah, this is a known issue. we put these examples for reference atm, but it requires a repository that is not public yet.
we plan to release them in the near future.