SPRINGFIELD — Illinois lawmakers gave final approval in the early hours of Friday morning to a new congressional redistricting plan that divides the state into 17 districts, one fewer than it currently has due to its loss of population since the 2010 U.S. Census.It was the fourth draft plan that legislative Democrats had proposed over the previous two weeks, and it was introduced to the public after 7 p.m.Like earlier versions, it collapses two southern Illinois districts into a single district while carving up much of …