CMake: make tests independent of Qt5/6

CMakeModules/CalamaresAddLibrary.cmake

@@ -86,9 +86,9 @@ function(calamares_add_library)
     # add link targets
     target_link_libraries(${target}
         LINK_PUBLIC ${Calamares_LIBRARIES}
-        Qt5::Core
-        Qt5::Gui
-        Qt5::Widgets
+        ${qtname}::Core
+        ${qtname}::Gui
+        ${qtname}::Widgets
     )
     if(LIBRARY_LINK_LIBRARIES)
         target_link_libraries(${target} LINK_PUBLIC ${LIBRARY_LINK_LIBRARIES})

CMakeModules/CalamaresAddTest.cmake

@@ -36,8 +36,8 @@ function(calamares_add_test name)
             LINK_LIBRARIES
                 Calamares::calamares
                 ${TEST_LIBRARIES}
-                Qt5::Core
-                Qt5::Test
+                ${qtname}::Core
+                ${qtname}::Test
         )
         calamares_automoc( ${TEST_NAME} )
         # We specifically pass in the source directory of the test-being-
@@ -47,7 +47,7 @@ function(calamares_add_test name)
             PRIVATE -DBUILD_AS_TEST="${CMAKE_CURRENT_SOURCE_DIR}" ${TEST_DEFINITIONS}
         )
         if(TEST_GUI)
-            target_link_libraries(${TEST_NAME} Calamares::calamaresui Qt5::Gui)
+            target_link_libraries(${TEST_NAME} Calamares::calamaresui ${qtname}::Gui)
         endif()
         if(TEST_RESOURCES)
             calamares_autorcc( ${TEST_NAME} ${TEST_RESOURCES} )