fix: adjust cmake conditions for <6.10 compatibility

Author: felixonmars

CMakeLists.txt

@@ -21,7 +21,9 @@ option(ENABLE_COV "Enable code coverage" OFF)
 if(PROJECT_VERSION_MAJOR EQUAL 6)
   set(VERSION_SUFFIX 6)
   find_package(QT NAMES Qt6 REQUIRED COMPONENTS Core)
-  find_package(Qt6 COMPONENTS CorePrivate GuiPrivate WidgetsPrivate REQUIRED)
+  if(Qt6_VERSION VERSION_GREATER_EQUAL 6.10)
+    find_package(Qt6 COMPONENTS CorePrivate GuiPrivate WidgetsPrivate REQUIRED)
+  endif()
 else()
   set(VERSION_SUFFIX)
   find_package(QT NAMES Qt5 REQUIRED COMPONENTS Core)