GUACAMOLE-197: Merge corrections to API compatibility for RADIUS auth.

extensions/guacamole-auth-radius/src/main/java/org/apache/guacamole/auth/radius/RadiusAuthenticationProvider.java

@@ -68,6 +68,20 @@ public class RadiusAuthenticationProvider implements AuthenticationProvider {
         return null;
     }
 
+    @Override
+    public UserContext decorate(UserContext context,
+            AuthenticatedUser authenticatedUser, Credentials credentials)
+            throws GuacamoleException {
+        return context;
+    }
+
+    @Override
+    public UserContext redecorate(UserContext decorated, UserContext context,
+            AuthenticatedUser authenticatedUser, Credentials credentials)
+            throws GuacamoleException {
+        return context;
+    }
+
     @Override
     public void shutdown() {
         // Do nothing