set STARPU_LIBRARIES_DEP in pkg-config case

CMakeModules/morse/find/FindSTARPU.cmake

@@ -231,6 +231,7 @@ if(PKG_CONFIG_EXECUTABLE)
     endif()
     set(STARPU_INCLUDE_DIRS_DEP "${STARPU_INCLUDE_DIRS}")
     set(STARPU_LIBRARY_DIRS_DEP "${STARPU_LIBRARY_DIRS}")
+    set(STARPU_LIBRARIES_DEP "${STARPU_LIBRARIES}")
 endif()