scipy: BUG: cythonization / compliation failure with development branch of cython

Describe your issue.

cython commit https://github.com/cython/cython/commit/77918c57b5f36bee708f625e2499bf05b23a87f1 in https://github.com/cython/cython/pull/4670 broke scipy installation. This is currently only on cython’s master branch and not in an alpha release yet.

I’m not sure if this is best fixed on the scipy or cython side.

I reported this via back-channels to @rgommers.

Reproducing Code Example

pip install -v --no-build-isolation .

with the development version of cython installed.

### Error message

```shell
The relevant error from compilation is :


  Error compiling Cython file:
  ------------------------------------------------------------
  ...
      if name == NULL:
          name_copy = name
      else:
          name_copy = strdup(name)

      capsule = PyCapsule_New(func, name_copy, &raw_capsule_destructor)
                                               ^
  ------------------------------------------------------------

  /home/tcaswell/source/p/scipy/scipy/scipy/_lib/_ccallback_c.pyx:80:45: Cannot assign type 'void (*)(object) except *' to 'PyCapsule_Destructor'
  Traceback (most recent call last):
    File "/home/tcaswell/source/p/scipy/scipy/scipy/_build_utils/cythoner.py", line 28, in <module>
      main()
    File "/home/tcaswell/source/p/scipy/scipy/scipy/_build_utils/cythoner.py", line 20, in main
      sbp.run(['cython', '-3', '--fast-fail',
    File "/home/tcaswell/.pybuild/bleeding/lib/python3.12/subprocess.py", line 571, in run
      raise CalledProcessError(retcode, process.args,
  subprocess.CalledProcessError: Command '['cython', '-3', '--fast-fail', '--output-file', '/home/tcaswell/source/p/scipy/scipy/.mesonpy-jnf3i747/build/scipy/_lib/_ccallback_c.cpython-312-x86_64-linux-gnu.so.p/_ccallback_c.c', '--include-dir', '/home/tcaswell/source/p/scipy/scipy/.mesonpy-jnf3i747/build', '/home/tcaswell/source/p/scipy/scipy/scipy/_lib/_ccallback_c.pyx']' returned non-zero exit status 1.

### SciPy/NumPy/Python version information

numpy main, cpython main, scipy main