TAIPEI, July 15 (Reuters) - Taiwanese prosecutors on Friday accused a Chinese Apple Inc (AAPL.O) supplier of stealing commercial secrets from a Taiwanese supplier and poaching its workforce to win orders from the U.S. company, saying it had charged 14 people. Taiwan has been stepping up efforts to stop what it views as underhand and illegal activities by Chinese firms to steal know-how and poach away talent in what Taipei's government views as a threat to the island's tech prowess. Prosecutors in New Taipei said after a year-and-a-half investigation they had found that China's Luxshare Precision Industry Co Ltd (002475.SZ)...