AccountUtil: cannot make callout after Savepoint

/*
 * @see http://salesforce.stackexchange.com/questions/27992/salesforce-unittest-exception-message-you-cannot-make-callout-after-creating-a
 */
public class AccountUtil {
    public static void createAccount() {
        System.Savepoint savepoint = Database.setSavepoint();

        try {
            insert new Account(Name = '#deleteafter ' + DateTime.now());
        }
        catch (System.DMLException caught) {
            Database.rollback(savepoint);
        }
    }

    public static String makeCallout() {
        HttpRequest request = new HttpRequest();
        request.setEndpoint('http://www.dilbert.com');
        request.setMethod('GET');

        HttpResponse response = new Http().send(request);

        return response.getBody();
    }
}