Make core/internal.hpp a private header

modules/imgproc/src/precomp.hpp

@@ -43,15 +43,13 @@
 #ifndef __OPENCV_PRECOMP_H__
 #define __OPENCV_PRECOMP_H__
 
-#ifdef HAVE_CVCONFIG_H
-#include "cvconfig.h"
-#endif
 
 #include "opencv2/imgproc.hpp"
 #include "opencv2/imgproc/imgproc_c.h"
 
 #include "opencv2/core/utility.hpp"
-#include "opencv2/core/internal.hpp"
+#include "opencv2/core/private.hpp"
+
 #include <math.h>
 #include <assert.h>
 #include <string.h>