Fix cmake for qt6

For Qt6, prior Qt 6.10 the private is implicity, 6.10 seems to be
explicit and has split cmake target.

Author: wengxt

qt6/CMakeLists.txt

@@ -1,11 +1,20 @@
 
-set(QT6_REQUIRED_COMPONENTS Core Gui GuiPrivate DBus Widgets)
+set(QT6_REQUIRED_COMPONENTS Core Gui DBus Widgets)
 
 if (ENABLE_QT6_WAYLAND_WORKAROUND)
-  list(APPEND QT6_REQUIRED_COMPONENTS WaylandClient WaylandClientPrivate WaylandGlobalPrivate)
+  list(APPEND QT6_REQUIRED_COMPONENTS WaylandClient WaylandGlobalPrivate)
 endif()
 find_package(Qt6 ${REQUIRED_QT6_VERSION} CONFIG REQUIRED COMPONENTS ${QT6_REQUIRED_COMPONENTS})
 
+if (NOT TARGET Qt6::GuiPrivate)
+    find_package(Qt6GuiPrivate CONFIG REQUIRED)
+endif()
+
+if (ENABLE_QT6_WAYLAND_WORKAROUND AND NOT TARGET Qt6::WaylandClientPrivate)
+    find_package(Qt6WaylandClientPrivate CONFIG REQUIRED)
+endif()
+
+
 add_subdirectory(dbusaddons)
 add_subdirectory(platforminputcontext)