While Crazydre's answer is factually correct, it's worth noting that "the next flight to Skopje" may be the following day, in which case they would have to provide you with accommodation and meals. Yet this means you'll arrive at your destination a day later, which may not be acceptable (e.g. you have connecting flights in Skopje or somebody is waiting for you, etc., etc.).
From personal experience, 1.5 hours is absolutely fine for international to international connection at Ataturk airport. I've travelled via that airport many, many times; the shortest connection I have had was 50 minutes - and I made it just fine, along with my luggage.