bpo-37221: Add PyCode_NewWithPosOnlyArgs to be used internally and set PyCode_New as a compatibility wrapper (GH-13959)

Add PyCode_NewEx to be used internally and set PyCode_New as a compatibility wrapper
diff --git a/Python/marshal.c b/Python/marshal.c
index caaddfe..b2daff2c 100644
--- a/Python/marshal.c
+++ b/Python/marshal.c
@@ -1396,7 +1396,7 @@
             if (lnotab == NULL)
                 goto code_error;
 
-            v = (PyObject *) PyCode_New(
+            v = (PyObject *) PyCode_NewWithPosOnlyArgs(
                             argcount, posonlyargcount, kwonlyargcount,
                             nlocals, stacksize, flags,
                             code, consts, names, varnames,