message: highgui: repair Qt backend
diff: @@ -51,6 +51,8 @@ set(OPENCV_HIGHGUI_BUILTIN_BACKEND "")
  if(HAVE_QT)
  set(OPENCV_HIGHGUI_BUILTIN_BACKEND "QT${QT_VERSION_MAJOR}")
  + add_definitions(-DHAVE_QT)
  +
  if(QT_VERSION_MAJOR GREATER 4)
  # "Automoc" doesn't work properly with opencv_world build, use QT<ver>_WRAP_CPP() directly
  #set(CMAKE_AUTOMOC ON)
  @@ -75,6 +77,7 @@ if(HAVE_QT)
  set(qt_deps Core Gui Widgets Test Concurrent)
  if(HAVE_QT_OPENGL)
  + add_definitions(-DHAVE_QT_OPENGL)
  list(APPEND qt_deps OpenGL)
  endif()
  