Fix Furnace cook time bug

If the server lags out and skips multiple ticks, Furnace cooking behavior would not
cook in the expected amount of time as the cook time was not decremented correctly.

This patch ensures that furnaces cook to the correct wall time expectation.

Spigot-Server-Patches/0088-Fix-Furnace-cook-time-bug.patch

@@ -0,0 +1,26 @@
+From 6872ee5a6ad3b144059d292e75a427bd30b102dc Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Fri, 18 Mar 2016 14:24:53 -0400
+Subject: [PATCH] Fix Furnace cook time bug
+
+If the server lags out and skips multiple ticks, Furnace cooking behavior would not
+cook in the expected amount of time as the cook time was not decremented correctly.
+
+This patch ensures that furnaces cook to the correct wall time expectation.
+
+diff --git a/src/main/java/net/minecraft/server/TileEntityFurnace.java b/src/main/java/net/minecraft/server/TileEntityFurnace.java
+index 1b17ca6..c242a7a 100644
+--- a/src/main/java/net/minecraft/server/TileEntityFurnace.java
++++ b/src/main/java/net/minecraft/server/TileEntityFurnace.java
+@@ -164,7 +164,7 @@ public class TileEntityFurnace extends TileEntityContainer implements ITickable,
+             this.cookTime += elapsedTicks;
+             if (this.cookTime >= this.cookTimeTotal) {
+                 this.cookTime = 0;
+-                this.cookTimeTotal = this.a(this.items[0]);
++                this.cookTimeTotal -= this.a(this.items[0]); // Paper - Fix Furnace cook time bug
+                 this.burn();
+                 flag1 = true;
+             }
+-- 
+2.7.3
+