Added build-denied action constant

don't need this, but good to have for completion's sake

src/pocketmine/network/mcpe/protocol/PlayerActionPacket.php

@@ -48,7 +48,7 @@ class PlayerActionPacket extends DataPacket{
 
 	const ACTION_START_GLIDE = 15;
 	const ACTION_STOP_GLIDE = 16;
-
+	const ACTION_BUILD_DENIED = 17;
 	const ACTION_CONTINUE_BREAK = 18;
 
 	public $entityRuntimeId;