Fixed some VS2008 warnings

lib/checkbufferoverrun.cpp

@@ -174,6 +174,8 @@ public:
     }
 
 private:
+    TokenStrEquals& operator=(const TokenStrEquals&); // disallow assignments
+
     const std::string value;
 };
 

lib/checkclass.h

@@ -140,6 +140,9 @@ private:
 
         /** @brief next Var item */
         Var *next;
+
+    private:
+        Var& operator=(const Var&); // disallow assignments
     };
 
     /**

lib/tokenize.cpp

@@ -18,6 +18,10 @@
 
 
 //---------------------------------------------------------------------------
+#ifdef _MSC_VER
+#pragma warning(disable: 4503)
+#endif
+
 #include "tokenize.h"
 #include "token.h"
 #include "filelister.h"