build(python): simplify rpycdec vendor layout

third_party/python/rpycdec/src/renpy/object.py

@@ -0,0 +1,33 @@
+class Object(object):
+    __version__ = 0
+
+    nosave = []
+
+    def __getstate__(self):
+        rv = vars(self).copy()
+
+        for f in self.nosave:
+            if f in rv:
+                del rv[f]
+
+        rv["__version__"] = self.__version__
+
+        return rv
+
+    # None, to prevent this from being called when unnecessary.
+    after_setstate = None
+
+    def __setstate__(self, new_dict):
+        version = new_dict.pop("__version__", 0)
+
+        self.__dict__.update(new_dict)
+
+        if version != self.__version__:
+            self.after_upgrade(version)  # E1101
+
+        if self.after_setstate:
+            self.after_setstate()  # E1102
+
+
+class Sentinel(object):
+    pass