[CMake] let the submodule manage VERSION

CMakeLists.txt

@@ -20,6 +20,7 @@ SET(CUSTOM_HEADER_DIR "dynamic-graph/python")
 
 SET(PKG_CONFIG_ADDITIONAL_VARIABLES plugindir ${PKG_CONFIG_ADDITIONAL_VARIABLES})
 
+CMAKE_POLICY(SET CMP0048 OLD)
 PROJECT(${PROJECT_NAME} CXX)
 
 FINDPYTHON()