SEC-717: Resolve UserDetails.getAuthorities() sort logic issue.

taglibs/src/test/java/org/springframework/security/taglibs/authz/AuthorizeTagCustomGrantedAuthorityTests.java

@@ -80,6 +80,10 @@ public class AuthorizeTagCustomGrantedAuthorityTests extends TestCase {
     private static class CustomGrantedAuthority implements GrantedAuthority {
         private final String authority;
 
+        public int compareTo(Object o) {
+			return 0;
+		}
+
 		public CustomGrantedAuthority(String authority) {
             this.authority = authority;
         }