kdsingleapplication: make Qt5/6 independent

3rdparty/kdsingleapplication/CMakeLists.txt

@@ -23,4 +23,4 @@ target_include_directories(
     PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
 )
 
-target_link_libraries(kdsingleapplication Qt5::Core Qt5::Network)
+target_link_libraries(kdsingleapplication ${qtname}::Core ${qtname}::Network)

3rdparty/kdsingleapplication/KDSingleApplicationConfig.cmake.in

-include(CMakeFindDependencyMacro)
-
-find_dependency(Qt5Widgets REQUIRED)
-find_dependency(Qt5Network REQUIRED)
-
-# Add the targets file
-include("${CMAKE_CURRENT_LIST_DIR}/KDSingleApplicationTargets.cmake")