Restore _PyLong_NumBits on Python 3.13 and later (#4450)

See python/cpython@cc663b7
PyO3 · Aug 18, 2024 · 57d85b1 · 57d85b1
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diff --git a/newsfragments/4450.changed.md b/newsfragments/4450.changed.md
@@ -0,0 +1 @@
+Restore `_PyLong_NumBits` on Python 3.13 and later
diff --git a/pyo3-ffi/src/longobject.rs b/pyo3-ffi/src/longobject.rs
@@ -92,7 +92,6 @@ extern "C" {
 #[cfg(not(Py_LIMITED_API))]
 extern "C" {
     #[cfg_attr(PyPy, link_name = "_PyPyLong_NumBits")]
-    #[cfg(not(Py_3_13))]
     pub fn _PyLong_NumBits(obj: *mut PyObject) -> size_t;
 }