fix(shim-sev): guard unused `use`
With debug_assertions, otherwise `cargo build --release` will give a
warning.
#[cfg(feature = "dbg")]
use crate::debug::{interrupt_trace, print_stack_trace};
+#[cfg(any(debug_assertions, feature = "dbg"))]
use crate::eprintln;
#[cfg(feature = "dbg")]
use crate::hostcall::shim_exit;
