remove some compiler warnings

src/syscalls/interfaces/mod.rs

@@ -6,6 +6,7 @@
 // http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
 // http://opensource.org/licenses/MIT>, at your option. This file may not be
 // copied, modified, or distributed except according to those terms.
+#![allow(unused)]
 
 use alloc::boxed::Box;
 use alloc::vec::Vec;