Add PTRACE_SET_SYSCALL_INFO constant

[Marcondiro]

Description

Add PTRACE_SET_SYSCALL_INFO constant.

PTRACE_SET_SYSCALL_INFO is a generic ptrace API that complements
PTRACE_GET_SYSCALL_INFO by letting the ptracer modify details of
system calls the tracee is blocked in.

Linux kernel patch: https://lore.kernel.org/lkml/20250303111910.GA24170@strace.io/

Sources

ptrace.h

Checklist

• Relevant tests in libc-test/semver have been updated
• No placeholder or unstable values like *LAST or *MAX are
  included (see #3131)
• Tested locally (cd libc-test && cargo test --target mytarget);
  especially relevant for platforms that may not be checked in CI

[JohnTitor]

Thanks!