By MacDonald Dzirutwe HARARE (Reuters) - Zimbabwean President Robert Mugabe said regional leaders will hold a summit to discuss how to fund an election later this year in which he is seeking to extend his three-decade rule, state media reported on Tuesday. Impoverished Zimbabwe needs $132 million for the election but conditions attached to the cash have divided the already fractious unity government, whose main players will be rivals for power in the vote. ...