[SYSCALL] Add various simple syscalls

[LukeShortCloud]

No description provided.

[LukeShortCloud]

I've been using this website as a nice reference for all system calls on x86_64 and aarch64:

https://www.chromium.org/chromium-os/developer-library/reference/linux-constants/syscalls/

When comparing unimplemented system calls in Box64, I first skipped ones I couldn't reliably test (for example, shutdown) and some calls that are unlikely to be used by a real-world app (for example, swapon).

AI disclaimer: I used Claude Ops 5 to further refine down the list and to also create tests to verify that more complex wrapping wasn't needed.

syscall_passthrough_test.py

[ptitSeb]

LGTM, thanks!