message: support choose qtwebkit or qtwebengine
diff: @@ -43,6 +43,8 @@ OPTION(BUILD_SHIBBOLETH_SUPPORT "Build Shibboleth support" OFF)
  option(BUILD_ENABLE_WARNINGS "Enable compiler warnings." ON)
  +option(USE_QT_WEBKIT "Build use QT webkit" OFF)
  +
  option(BUILD_SPARKLE_SUPPORT "Build Sparkle support" OFF)
  IF (BUILD_SPARKLE_SUPPORT)
  ADD_DEFINITIONS(-DHAVE_SPARKLE_SUPPORT)
  @@ -164,7 +166,7 @@ EXECUTE_PROCESS(COMMAND
  OUTPUT_VARIABLE DETECTED_QT_VERSION
  OUTPUT_STRIP_TRAILING_WHITESPACE)
  MESSAGE("qt5 version: ${DETECTED_QT_VERSION}")
  -IF(WIN32 OR DETECTED_QT_VERSION VERSION_LESS 5.6.0)
  +IF(USE_QT_WEBKIT)
  ADD_DEFINITIONS(-DSEAFILE_USE_WEBKIT)
  SET(WEBKIT_NAME "WebKit")
  SET(WEBKIT_WIDGETS_NAME "WebKitWidgets")
  