Minor: fix unicode-related inline function warnings

[wjakob]

When compiling my extension module against latest main version of CPython, I get many warnings related to unused parameters in unicodeobject.h. Example:

In file included from /Users/wjakob/nanobind/src/tensor.cpp:1:
In file included from /Users/wjakob/nanobind/include/nanobind/tensor.h:14:
In file included from /Users/wjakob/nanobind/include/nanobind/nanobind.h:37:
In file included from /Users/wjakob/nanobind/include/nanobind/nb_python.h:22:
In file included from /Users/wjakob/cpython-dist/include/python3.12/Python.h:51:
In file included from /Users/wjakob/cpython-dist/include/python3.12/unicodeobject.h:1029:
/Users/wjakob/cpython-dist/include/python3.12/cpython/unicodeobject.h:196:57: warning: unused parameter 'op' [-Wunused-parameter]
static inline unsigned int PyUnicode_IS_READY(PyObject *op) {
                                                        ^
/Users/wjakob/cpython-dist/include/python3.12/cpython/unicodeobject.h:416:45: warning: unused parameter 'op' [-Wunused-parameter]
static inline int PyUnicode_READY(PyObject *op)
                                            ^

This PR fixes those warnings. This isn't really a bug in Python, so I did not create a corresponding issue tracker ticket.

[ghost]

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[bedevere-bot]

Most changes to Python require a NEWS entry.

Please add it using the blurb_it web app or the blurb command-line tool.

[wjakob]

@bedevere-bot (This issue seems too minor to warrant an issue number or a NEWS entry)

[JelleZijlstra]

Thanks for your contribution! cc @vstinner who worked on this file recently.

I think we can skip the news entry here because the problem it fixes hasn't been in any release (it's in the main branch only). If it had been in a release, we should have added a NEWS entry because it's a user-visible change.

I'll leave this open for a few days in case Victor or others have comments, and then merge.

[vstinner]

Thanks for your contribution! cc @vstinner who worked on this file recently.

cc @methane who introduced the warning.

[wjakob]

(Commit amended with tweaked syntax)

[vstinner]

LGTM.

[vstinner]

Merged, thanks.