Update CMakeLists.txt

WinRT parallels library is causing conflicts in VC++ due to inconsistent usage with C++/CX which is now present in parallels.cpp.  This support should be included in all projects with WinRT specific code except if doing special native C++ tasks.

modules/core/CMakeLists.txt

@@ -11,6 +11,10 @@ if(WINRT AND CMAKE_SYSTEM_NAME MATCHES WindowsStore AND CMAKE_SYSTEM_VERSION MAT
   list(APPEND extra_libs ole32.lib)
 endif()
 
+if(DEFINED WINRT AND NOT DEFINED ENABLE_WINRT_MODE_NATIVE)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /ZW")
+endif()
+
 if(HAVE_CUDA)
   ocv_warnings_disable(CMAKE_CXX_FLAGS -Wundef -Wenum-compare -Wunused-function -Wshadow)
 endif()