Anniversary bonus payments to long-time Volkswagen employees are among the many pay perks company bosses want to slash as part of deep cuts at the German automaker, a VW spokeswoman confirmed to dpa on Saturday. VW has threatened to close plants in Germany, while labour leaders have warned of mass layoffs of tens of thousands of workers in the country as the automaker contends with falling profits and stiff competition. VW executives and trade union leaders are currently negotiating a collective bargaining deal for the company’s workers in Germany. According to the union, VW has demanded 10% a…