Update from upstream SpigotMC

Fix LEFT_CLICK_AIR detection when not in creative SpigotMC/Spigot@883534a72a

CraftBukkit-Patches/0171-Fix-LEFT_CLICK_AIR-detection-when-not-in-creative.patch

@@ -0,0 +1,21 @@
+From ca596392f362f870968fbfe4c51b6de4b2f36127 Mon Sep 17 00:00:00 2001
+From: Thinkofdeath <thinkofdeath@spigotmc.org>
+Date: Thu, 7 Aug 2014 15:48:33 +0100
+Subject: [PATCH] Fix LEFT_CLICK_AIR detection when not in creative
+
+
+diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
+index 97037ff..0e2bc03 100644
+--- a/src/main/java/net/minecraft/server/PlayerConnection.java
++++ b/src/main/java/net/minecraft/server/PlayerConnection.java
+@@ -1044,7 +1044,7 @@ public class PlayerConnection implements PacketPlayInListener {
+             float f6 = MathHelper.sin(-f1 * 0.017453292F);
+             float f7 = f4 * f5;
+             float f8 = f3 * f5;
+-            double d3 = 5.0D;
++            double d3 = player.playerInteractManager.getGameMode() == EnumGamemode.CREATIVE ? 5.0D : 4.5D; // Spigot
+             Vec3D vec3d1 = vec3d.add((double) f7 * d3, (double) f6 * d3, (double) f8 * d3);
+             MovingObjectPosition movingobjectposition = this.player.world.rayTrace(vec3d, vec3d1, false);
+ 
+-- 
+1.9.1