Use qt5 version of system-wide libraries

src/CMakeLists.txt

@@ -914,6 +914,7 @@ target_link_libraries(strawberry_lib
   ${QT_LIBRARIES}
   ${CHROMAPRINT_LIBRARIES}
   ${QTSINGLEAPPLICATION_LIBRARIES}
+  ${QTSINGLECOREAPPLICATION_LIBRARIES}
   ${CMAKE_THREAD_LIBS_INIT}
   ${SQLITE_LIBRARIES}
   ${QOCOA_LIBRARIES}