Excise DL_EXPORT from Include.

Thanks to Skip Montanaro and Kalle Svensson for the patches.
diff --git a/Include/listobject.h b/Include/listobject.h
index 1befe86..14ed72e 100644
--- a/Include/listobject.h
+++ b/Include/listobject.h
@@ -24,22 +24,22 @@
     PyObject **ob_item;
 } PyListObject;
 
-extern DL_IMPORT(PyTypeObject) PyList_Type;
+PyAPI_DATA(PyTypeObject) PyList_Type;
 
 #define PyList_Check(op) PyObject_TypeCheck(op, &PyList_Type)
 #define PyList_CheckExact(op) ((op)->ob_type == &PyList_Type)
 
-extern DL_IMPORT(PyObject *) PyList_New(int size);
-extern DL_IMPORT(int) PyList_Size(PyObject *);
-extern DL_IMPORT(PyObject *) PyList_GetItem(PyObject *, int);
-extern DL_IMPORT(int) PyList_SetItem(PyObject *, int, PyObject *);
-extern DL_IMPORT(int) PyList_Insert(PyObject *, int, PyObject *);
-extern DL_IMPORT(int) PyList_Append(PyObject *, PyObject *);
-extern DL_IMPORT(PyObject *) PyList_GetSlice(PyObject *, int, int);
-extern DL_IMPORT(int) PyList_SetSlice(PyObject *, int, int, PyObject *);
-extern DL_IMPORT(int) PyList_Sort(PyObject *);
-extern DL_IMPORT(int) PyList_Reverse(PyObject *);
-extern DL_IMPORT(PyObject *) PyList_AsTuple(PyObject *);
+PyAPI_FUNC(PyObject *) PyList_New(int size);
+PyAPI_FUNC(int) PyList_Size(PyObject *);
+PyAPI_FUNC(PyObject *) PyList_GetItem(PyObject *, int);
+PyAPI_FUNC(int) PyList_SetItem(PyObject *, int, PyObject *);
+PyAPI_FUNC(int) PyList_Insert(PyObject *, int, PyObject *);
+PyAPI_FUNC(int) PyList_Append(PyObject *, PyObject *);
+PyAPI_FUNC(PyObject *) PyList_GetSlice(PyObject *, int, int);
+PyAPI_FUNC(int) PyList_SetSlice(PyObject *, int, int, PyObject *);
+PyAPI_FUNC(int) PyList_Sort(PyObject *);
+PyAPI_FUNC(int) PyList_Reverse(PyObject *);
+PyAPI_FUNC(PyObject *) PyList_AsTuple(PyObject *);
 
 /* Macro, trading safety for speed */
 #define PyList_GET_ITEM(op, i) (((PyListObject *)(op))->ob_item[i])