MacroAddFileDependencies: Simplify implementation

Modules/MacroAddFileDependencies.cmake

@@ -18,13 +18,6 @@ OBJECT_DEPENDS depend_files) instead.
 
 macro (MACRO_ADD_FILE_DEPENDENCIES _file)
 
-  get_source_file_property(_deps ${_file} OBJECT_DEPENDS)
-  if (_deps)
-    set(_deps ${_deps} ${ARGN})
-  else ()
-    set(_deps ${ARGN})
-  endif ()
-
-  set_source_files_properties(${_file} PROPERTIES OBJECT_DEPENDS "${_deps}")
+  set_property(SOURCE "${_file}" APPEND PROPERTY OBJECT_DEPENDS "${ARGN}")
 
 endmacro ()