In 2015, the Libertines staged a comeback with “Anthems for Doomed Youth.” But it has taken the British indie-rock band nine years to follow up with another album. Their latest studio record “All Quiet On The Eastern Esplanade,” the band’s fourth, is out on April 5, marking the second album since they got back together. The members of the London band formed in 1997 have become something like the elder statesmen of indie rock after the escapades of frontman Pete Doherty, his relationship with supermodel Kate Moss, his drug abuse and clashes with bandmate Carl Barât characterized British pop cul…