Add teeos

Signed-off-by: 袁浩 <[email protected]>

Author: 袁浩

src/lib.rs

@@ -139,6 +139,12 @@ cfg_if! {
 
         mod hermit;
         pub use hermit::*;
+    } else if #[cfg(target_os = "teeos")] {
+        mod fixed_width_ints;
+        pub use fixed_width_ints::*;
+
+        mod teeos;
+        pub use teeos::*;
     } else if #[cfg(all(target_env = "sgx", target_vendor = "fortanix"))] {
         mod fixed_width_ints;
         pub use fixed_width_ints::*;