Revert "Only check for async callers, do not remove potentially used variables"

This reverts commit 271e7c5cb4.

Spigot-Server-Patches/Check-async-remove-unused-vars-GH-159.patch

@@ -1,7 +1,7 @@
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Zach Brown <1254957+zachbr@users.noreply.github.com>
 Date: Sun, 27 Mar 2016 20:24:05 -0500
-Subject: [PATCH] Check async, eligible spawn chunks, GH-159
+Subject: [PATCH] Check async, remove unused vars, GH-159
 
 
 diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java
@@ -16,4 +16,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          if (!flag && !flag1) {
              return 0;
          } else {
+@@ -0,0 +0,0 @@ public final class SpawnerCreature {
+                 // CraftBukkit end
+ 
+                 if ((!enumcreaturetype.d() || flag1) && (enumcreaturetype.d() || flag) && (!enumcreaturetype.e() || flag2)) {
++                    /* Paper start - As far as I can tell neither of these are even used
+                     k = worldserver.a(enumcreaturetype.a());
+                     int l1 = limit * i / a; // CraftBukkit - use per-world limits
++                    */ // Paper end
+ 
+                     if ((mobcnt = getEntityCount(worldserver, enumcreaturetype.a())) <= limit * i / 256) {
+                         BlockPosition.MutableBlockPosition blockposition_mutableblockposition = new BlockPosition.MutableBlockPosition();
 --