Boston-based LogMeIn Inc. said Monday that it cleared a significant regulatory hurdle in its trek to merge with Ft. Lauderdale-based Citrix System Inc.’s GoTo business in a deal valued at approximately $1.8 billion. LogMeIn (Nasdaq: LOGM) said that it received U.S. Federal Trade Commission clearance for the merger. The combined company is expected to have annual revenue in excess of $1 billion with more than 2 million customers in virtually every country around the globe, the companies said in…