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

modules/core/include/opencv2/core/internal.hpp

@@ -59,16 +59,7 @@
 #  endif
 #endif
 
-#if 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
-#else
+#if !defined WIN32 && !defined WINCE
 #  include <pthread.h>
 #endif