After 14 years of self-funded promotion, the nation's swine industry has decided by a 5% vote margin that it's tired of "Pork. The Other White Meat" and related campaigns, according to a referendum cleared by the U.S. Department of Agriculture.    The National Pork Producers Council has vowed to fight in court to overturn the Pork Checkoff Program referendum process and outcome. The council claims the process was tainted by illegal votes, mistakes in voter verification, other voting irregularities and confusion, and referendum mismanagement by the USDA.