Drop itanium_demangler dependency

Index: angr/procedures/definitions/__init__.py
--- angr/procedures/definitions/__init__.py.orig
+++ angr/procedures/definitions/__init__.py
@@ -6,7 +6,6 @@ import logging
 import inspect
 from typing import Optional, Dict, Type, TYPE_CHECKING
 
-import itanium_demangler
 
 from ...sim_type import parse_cpp_file, SimTypeFunction
 from ...calling_conventions import DEFAULT_CC
@@ -284,6 +283,7 @@ class SimCppLibrary(SimLibrary):
 
     @staticmethod
     def _try_demangle(name):
+        """
         if name[0:2] == "_Z":
             try:
                 ast = itanium_demangler.parse(name)
@@ -291,6 +291,7 @@ class SimCppLibrary(SimLibrary):
                 return name
             if ast:
                 return str(ast)
+        """
         return name
 
     @staticmethod
