June 7 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 1200 GMT on Thursday: ** Japan's Fujifilm Holdings Corp said it may have no choice but to abandon a $6.1 billion merger with Xerox Corp if there is no progress in talks with the U.S. firm's new board for about half a year. ** U.S. insurer AmTrust Financial Services Inc agreed to be acquired by a group of investors for a sweetened deal value of $2.95 billion, that helped secure the support of dissenting sh