Add casts to work around missing extern "C" in Python headers.

[SVN r14735]

src/object/function.cpp

@@ -298,8 +298,8 @@ extern "C"
     }
     
     static PyGetSetDef function_getsetlist[] = {
-        {"__name__", function_get_name, 0 },
-        {"__doc__", function_get_doc, function_set_doc},
+        {"__name__", (getter)function_get_name, 0 },
+        {"__doc__", (getter)function_get_doc, (setter)function_set_doc},
 	{NULL} /* Sentinel */
     };
 }