Update CMakeLists.txt

Fix C++/CX support for all WINRT and bring back native-mode only support which was removed

modules/videoio/CMakeLists.txt

@@ -7,7 +7,7 @@ ocv_add_module(videoio opencv_imgproc opencv_imgcodecs WRAP java python)
 #   Jose Luis Blanco, 2008
 # ----------------------------------------------------------------------------
 
-if(WINRT_8_1)
+if(DEFINED WINRT AND NOT DEFINED ENABLE_WINRT_MODE_NATIVE)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /ZW")
 endif()
 
@@ -38,7 +38,7 @@ list(REMOVE_ITEM videoio_ext_hdrs "${CMAKE_CURRENT_LIST_DIR}/include/opencv2/${n
 # Dependencies used by the implementation referenced
 # below are not available on WinRT 8.0.
 # Enabling it for WiRT 8.1+ only.
-if(DEFINED WINRT AND NOT DEFINED WINRT_8_0)
+if(DEFINED WINRT AND NOT DEFINED WINRT_8_0 AND NOT DEFINED ENABLE_WINRT_MODE_NATIVE)
 
     # WinRT detected. Adding WinRT API header
     message(STATUS "  ${name}: WinRT detected. Adding WinRT API header")