renamed gpu* source to cuda* in core module

modules/gpu/include/opencv2/gpu.hpp

@@ -44,10 +44,10 @@
 #define __OPENCV_GPU_HPP__
 
 #ifndef __cplusplus
-#  error gpu.hpp header must be compiled as C++
+#  error cuda.hpp header must be compiled as C++
 #endif
 
-#include "opencv2/core/gpu.hpp"
+#include "opencv2/core/cuda.hpp"
 
 namespace cv { namespace cuda {
 

modules/gpu/src/precomp.hpp

@@ -49,7 +49,7 @@
 #include "opencv2/calib3d.hpp"
 #include "opencv2/objdetect.hpp"
 
-#include "opencv2/core/private.gpu.hpp"
+#include "opencv2/core/private.cuda.hpp"
 
 #include "opencv2/opencv_modules.hpp"