Issue #18701: Remove sqlitecompat.h.

Modules/_sqlite/sqlitecompat.h

-/* sqlitecompat.h - compatibility macros
- *
- * Copyright (C) 2006-2010 Gerhard Häring <gh@ghaering.de>
- *
- * This file is part of pysqlite.
- *
- * This software is provided 'as-is', without any express or implied
- * warranty.  In no event will the authors be held liable for any damages
- * arising from the use of this software.
- *
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- *
- * 1. The origin of this software must not be misrepresented; you must not
- *    claim that you wrote the original software. If you use this software
- *    in a product, an acknowledgment in the product documentation would be
- *    appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- *    misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- */
-
-#include "Python.h"
-
-#ifndef PYSQLITE_COMPAT_H
-#define PYSQLITE_COMPAT_H
-
-/* define Py_ssize_t for pre-2.5 versions of Python */
-
-#if PY_VERSION_HEX < 0x02050000
-typedef int Py_ssize_t;
-typedef int (*lenfunc)(PyObject*);
-#endif
-
-
-/* define PyDict_CheckExact for pre-2.4 versions of Python */
-#ifndef PyDict_CheckExact
-#define PyDict_CheckExact(op) ((op)->ob_type == &PyDict_Type)
-#endif
-
-/* define Py_CLEAR for pre-2.4 versions of Python */
-#ifndef Py_CLEAR
-#define Py_CLEAR(op)				\
-        do {                            	\
-                if (op) {			\
-                        PyObject *tmp = (PyObject *)(op);	\
-                        (op) = NULL;		\
-                        Py_DECREF(tmp);		\
-                }				\
-        } while (0)
-#endif
-
-#ifndef PyVarObject_HEAD_INIT
-#define PyVarObject_HEAD_INIT(type, size) \
-    PyObject_HEAD_INIT(type) size,
-#endif
-
-#ifndef Py_TYPE
-#define Py_TYPE(ob) ((ob)->ob_type)
-#endif
-
-#endif