Fixed compilation without PCH enabled

please avoid to miss header files in your sources

src/game/DungeonFinding/LFG.h

@@ -9,6 +9,9 @@
 #define _LFG_H
 
 #include "Common.h"
+#include "ObjectDefines.h"
+#include "SharedDefines.h"
+#include "WorldPacket.h"
 
 namespace lfg
 {

src/game/DungeonFinding/LFGMgr.cpp

@@ -23,6 +23,7 @@
 #include "GroupMgr.h"
 #include "GameEventMgr.h"
 #include "WorldSession.h"
+#include "Opcodes.h"
 
 namespace lfg
 {

src/game/DungeonFinding/LFGMgr.h

@@ -15,6 +15,7 @@
 #include "LFGQueue.h"
 #include "LFGGroupData.h"
 #include "LFGPlayerData.h"
+#include "Map.h"
 
 class Group;
 class Player;