Update to MC 1.12-pre2

Spigot-Server-Patches/Optimize-Pathfinding.patch

@@ -7,7 +7,7 @@ Prevents pathfinding from spamming failures for things such as
 arrow attacks.
 
 diff --git a/src/main/java/net/minecraft/server/NavigationAbstract.java b/src/main/java/net/minecraft/server/NavigationAbstract.java
-index 4f28b8819..43b2be505 100644
+index 26319d9b7..3e598afd4 100644
 --- a/src/main/java/net/minecraft/server/NavigationAbstract.java
 +++ b/src/main/java/net/minecraft/server/NavigationAbstract.java
 @@ -0,0 +0,0 @@ public abstract class NavigationAbstract {
@@ -41,7 +41,7 @@ index 4f28b8819..43b2be505 100644
 @@ -0,0 +0,0 @@ public abstract class NavigationAbstract {
      }
  
-     public void o() {
+     public void p() {
 +        this.pathfindFailures = 0; this.lastFailure = 0; // Paper - Pathfinding optimizations
          this.c = null;
      }