Remove windows.h include from opencv2/core/internal.hpp to avoid conflicts with TBB library.

modules/core/src/system.cpp

@@ -43,6 +43,14 @@
 #include "precomp.hpp"
 
 #if defined WIN32 || defined _WIN32 || defined WINCE
+#ifndef _WIN32_WINNT           // This is needed for the declaration of TryEnterCriticalSection in winbase.h with Visual Studio 2005 (and older?)
+  #define _WIN32_WINNT 0x0400  // http://msdn.microsoft.com/en-us/library/ms686857(VS.85).aspx
+#endif
+#include <windows.h>
+#undef small
+#undef min
+#undef max
+#undef abs
 #include <tchar.h>
 #if defined _MSC_VER
   #if _MSC_VER >= 1400