GUACAMOLE-210: Update for recent sharing-related changes to AuthenticationProvider on 0.9.9-incubating (current upstream git).

extensions/guacamole-auth-openid/src/main/java/org/apache/guacamole/auth/oauth/OAuthAuthenticationProvider.java

@@ -94,7 +94,8 @@ public class OAuthAuthenticationProvider implements AuthenticationProvider {
 
     @Override
     public UserContext updateUserContext(UserContext context,
-            AuthenticatedUser authenticatedUser) throws GuacamoleException {
+            AuthenticatedUser authenticatedUser, Credentials credentials)
+            throws GuacamoleException {
 
         // No update necessary
         return context;