The USS Olympia served as Adm. George Dewey’s flagship during the Spanish-American War and brought the body of World War I’s  “Unknown Soldier” home from Europe in 1921. Since 1957, it’s been pierside in Philadelphia as a museum ship. But now, as funds are drying up, the ship has three potential fates: Move homeports, get sunk or get scrapped. The Philadelphia waterfront’s Independence Seaport Museum can no longer afford to take care of the ship. Officials have looked for three years for new caretakers but time is running out. Of a handful of groups that have expressed interest, two are still…