Compilation fixes for MSVS.

Apparently it doesn't like structs converted to class, needs more investigation.

lib/BattleHex.h

@@ -8,13 +8,12 @@
  *
  */
 #pragma once
-#include <bits/stl_pair.h>
 #include "GameConstants.h"
 
 // for battle stacks' positions
-class DLL_LINKAGE BattleHex
+struct DLL_LINKAGE BattleHex
 {
-public:
+//public:
 	si16 hex;
 	static const si16 INVALID = -1;
 	enum EDir { RIGHT, BOTTOM_RIGHT, BOTTOM_LEFT, LEFT, TOP_LEFT, TOP_RIGHT };

lib/BattleState.cpp

@@ -10,6 +10,7 @@
 
 #include "StdInc.h"
 #include "BattleState.h"
+#include "BattleHex.h"
 
 #include <numeric>
 #include "VCMI_Lib.h"

lib/CObstacleInstance.cpp

@@ -4,6 +4,7 @@
 #include "CTownHandler.h"
 #include "VCMI_Lib.h"
 #include "spells/CSpellHandler.h"
+#include "BattleHex.h"
 
 /*
  * CObstacleInstance.cpp, part of VCMI engine