message: Fix import of user_regs_struct
diff: @@ -8,10 +8,15 @@ use super::super::{errno, types::*, Pal, PalPtrace, PalSignal, Sys};
  use crate::{
  c_str::CString,
  fs::File,
  - header::{errno as errnoh, fcntl, signal, sys_ptrace, sys_user::user_regs_struct},
  + header::{errno as errnoh, fcntl, signal, sys_ptrace},
  io::{self, prelude::*},
  sync::{Mutex, Once},
  };
  +#[cfg(target_arch = "aarch64")]
  +use crate::header::arch_aarch64_user::user_regs_struct;
  +#[cfg(target_arch = "x86_64")]
  +use crate::header::arch_x64_user::user_regs_struct;
  +
  use alloc::collections::{btree_map::Entry, BTreeMap};
  use core::mem;
  use syscall;
  