Add Trusty OS to the generic error implementation.

Background:
* During this refactor, the Trusty OS was not targeted in the cfg_select
  e259373

Author: chaos2007

library/std/src/sys/io/error/mod.rs

@@ -43,6 +43,7 @@ cfg_select! {
         target_os = "vexos",
         target_family = "wasm",
         target_os = "zkvm",
+        target_os = "trusty",
     ) => {
         mod generic;
         pub use generic::*;