Handset makers Inventec Appliances and Quanta Computer are competing to become Apple’s second assembly partner for the iPhone, according to a DigiTimes report. Quanta president Michael Wang has set a goal to aggressively strive to become a partner for iPhone production. A recent Goldman Sachs report claims that while Foxconn Electronics remains the exclusive supplier for US-bound iPhones, orders have been split with Quanta for the European version…