fixed DLL_LINKAGE for << operators

lib/CSkillHandler.h

@@ -56,8 +56,8 @@ public:
 	}
 
 	friend class CSkillHandler;
-	friend std::ostream & operator<<(std::ostream & out, const CSkill & skill);
-	friend std::ostream & operator<<(std::ostream & out, const CSkill::LevelInfo & info);
+	friend DLL_LINKAGE std::ostream & operator<<(std::ostream & out, const CSkill & skill);
+	friend DLL_LINKAGE std::ostream & operator<<(std::ostream & out, const CSkill::LevelInfo & info);
 };
 
 class DLL_LINKAGE CSkillHandler: public CHandlerBase<SecondarySkill, CSkill>