Fix nonPCH build. Thanks to liszt.

Fixes #1385

src/server/game/Battlegrounds/ArenaTeam.h

@@ -20,6 +20,8 @@
 #define TRINITYCORE_ARENATEAM_H
 
 #include "QueryResult.h"
+#include "Player.h"
+#include "ObjectMgr.h"
 
 class WorldSession;
 

src/server/game/Groups/Group.h

@@ -25,6 +25,7 @@
 #include "LootMgr.h"
 #include "QueryResult.h"
 #include "SharedDefines.h"
+#include "Player.h"
 
 class Creature;
 class GroupReference;