[BUG] Duplicate __Pyx_PyInt_As_int functions

[FrancescAlted]

Describe the bug

We are having an issue when migrating to recent Cython 3.0. The compiler issues the next error:

/Users/faltet/blosc/python-blosc2/_skbuild/macosx-13.0-arm64-3.11/cmake-build/blosc2/blosc2_ext.c:71562:28: error: redefinition of '__Pyx_PyInt_As_int'
  static CYTHON_INLINE int __Pyx_PyInt_As_int(PyObject *x) {
                           ^
/Users/faltet/blosc/python-blosc2/_skbuild/macosx-13.0-arm64-3.11/cmake-build/blosc2/blosc2_ext.c:69734:28: note: previous definition is here
  static CYTHON_INLINE int __Pyx_PyInt_As_int(PyObject *x) {
                           ^
2 warnings and 1 error generated.
make[2]: *** [blosc2/CMakeFiles/blosc2_ext.dir/blosc2_ext.c.o] Error 1
make[1]: *** [blosc2/CMakeFiles/blosc2_ext.dir/all] Error 2
make: *** [all] Error 2

Code to reproduce the behaviour:

You can reproduce the issue by going to the python-blosc2 project at: https://github.com/Blosc/python-blosc2 and compile the extension with regular:

python setup.py build_ext -j 8 -i

Expected behaviour

We are expecting a successful compilation. Actually, we are using Cython < 3 for many years, and never had this issue before.

OS

macOSX, Linux

Python version

any

Cython version

3.0.0

Additional context

No response