Python C API Deprecations

[Avasam]

I extracted those from the current warning C4996: 'xx': deprecated in 3.xx build messages.

Deprecated since Python 3.11:

• Py_SetProgramName
  • Set PyConfig.program_name instead.
• PySys_SetArgv
  • Set PyConfig.argv instead.

Deprecated since Python 3.12:

• Py_FrozenFlag Stop using (exposing) deprecated Py_FrozenFlag #2593
  • Use PyConfig.pathconfig_warnings instead.

  • Changed in version 3.11: Now also applies on Windows.

Deprecated since Python 3.13:

• PyWeakref_GetObject
  • Use PyWeakref_GetRef() instead.

  • Added in version 3.13.

All of the above are Pending removal in Python 3.15 (if not pushed back further).

Deprecated since Python 3.14 (Pending removal in Python 3.18):

• _Py_HashPointer Fix new 3.14 C API deprecation for _Py_HashPointer #2602
  • Use Py_HashPointer().

  • Added in version 3.13.

• _PyUnicode_AsString: Replace _PyUnicode_AsString and PYWIN_ATTR_CONVERT with PyUnicode_AsUTF8 #2591
  • Use PyUnicode_AsUTF8().

  • Added in version 3.3.

  • Changed in version 3.7: The return type is now const char * rather of char *.

• _PyLong_Sign Fix new 3.14 C API deprecation for _PyLong_Sign #2603
  • Use PyLong_GetSign().

  • Added in version 3.14.

---

Because of the replacements are late additions, we may not be able to resolve them immediately. If the signatures / usage are close enough, a simple macro could do.

[Avasam]

PySys_SetArgv is also used by SWIG 1.1 which we use. But only in python/embed.i, python/embed13.i and python/embed14.i .
python/embed.i and python/embed13.i are included by autodoc.i

It doesn't look like autodoc.i is referenced anywhere. The code still builds without those files. So those instances should be safe to ignore (or just drop the vendored files, until we update/revendor SWIG).