Fix private name mangling.  The symtable also must do mangles so that
the scope of names can be correctly determined.
diff --git a/Include/symtable.h b/Include/symtable.h
index c8d8636..ad7334b 100644
--- a/Include/symtable.h
+++ b/Include/symtable.h
@@ -17,7 +17,7 @@
         PyObject *st_stack;      /* stack of namespace info */
 	PyObject *st_global;     /* borrowed ref to MODULE in st_symbols */
 	int st_nblocks;          /* number of blocks */
-	char *st_private;        /* name of current class or NULL */
+	PyObject *st_private;        /* name of current class or NULL */
         int st_tmpname;          /* temporary name counter */
 	PyFutureFeatures *st_future; /* module's future features */
 };