removed lib-graalpython/itertools.py

Author: tomasstupka

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/Python3Core.java

@@ -318,7 +318,6 @@ private static String[] initializeCoreFiles() {
                         "_frozen_importlib",
                         "__graalpython__",
                         "_weakref",
-                        "itertools",
                         "faulthandler",
                         "base_exception",
                         PythonCextBuiltins.PYTHON_CEXT,