Use versionless Qt cmake target

This makes it easier to build against both Qt5 and Qt6

GIT_SILENT

lib/CMakeLists.txt

@@ -20,9 +20,9 @@ add_library(milou SHARED ${lib_SRCS})
 set_target_properties(milou PROPERTIES VERSION ${PROJECT_VERSION} SOVERSION ${PROJECT_VERSION_MAJOR} )
 
 target_link_libraries (milou
-    Qt5::Qml
-    Qt5::Quick
-    Qt5::Widgets # for QAction...
+    Qt::Qml
+    Qt::Quick
+    Qt::Widgets # for QAction...
     KF5::ItemModels
     KF5::Service
     KF5::Plasma

lib/qml/CMakeLists.txt

@@ -6,7 +6,7 @@ set (plugin_SRCS
 add_library (milouqmlplugin SHARED ${plugin_SRCS})
 
 target_link_libraries (milouqmlplugin
-    Qt5::Qml
+    Qt::Qml
 
     milou
 )

lib/test/CMakeLists.txt

@@ -7,9 +7,9 @@ add_executable(modeltest test.cpp)
 ecm_mark_as_test(modeltest)
 
 target_link_libraries(modeltest
-  Qt5::Core
-  Qt5::Test
-  Qt5::Gui
+  Qt::Core
+  Qt::Test
+  Qt::Gui
   milou
 )
 
@@ -17,9 +17,9 @@ add_executable(widgettest widgettest.cpp)
 ecm_mark_as_test(widgettest)
 
 target_link_libraries(widgettest
-  Qt5::Core
-  Qt5::Gui
-  Qt5::Widgets
+  Qt::Core
+  Qt::Gui
+  Qt::Widgets
   milou
 )
 
@@ -27,8 +27,8 @@ add_executable(previewtest previewtest.cpp)
 ecm_mark_as_test(previewtest)
 
 target_link_libraries(previewtest
-  Qt5::Core
-  Qt5::Gui
-  Qt5::Widgets
+  Qt::Core
+  Qt::Gui
+  Qt::Widgets
   milou
 )