MEXICO CITY (Reuters) - Mexico said on Thursday it would decide within about 15 days what sanctions to impose on U.S. meat products if the U.S. Congress does not comply with a World Trade Organization ruling on labeling. On Monday, the WTO ruled that U.S. country-of-origin labeling (COOL) laws discriminated against imported meat from Mexico and Canada. "We have our teams prepared and working, specialists in international law...in case the U.S. Congress doesn't comply," Enrique Martinez, Mexico's agriculture minister, said at a news conference. "I think in some 15 days we will have a clearer idea," Martinez added, of "what...