Explictly name the "crate::cipher::MessageDecrypter" import when expo…

…rting "crate::internal::cipher" from "rustls/src/lib.rs", as suggested in the #815 pull request

rustls/src/lib.rs

@@ -340,7 +340,7 @@ pub mod internal {
     }
     /// Low-level TLS message decryption functions.
     pub mod cipher {
-        pub use crate::cipher::*;
+        pub use crate::cipher::MessageDecrypter;
     }
 }