gh-112026: Add again _PyThreadState_UncheckedGet() function (#112121)

Add again the private _PyThreadState_UncheckedGet() function as an
alias to the new public PyThreadState_GetUnchecked() function.

Author: vstinner

Include/cpython/pystate.h

@@ -231,6 +231,9 @@ struct _ts {
  * if it is NULL. */
 PyAPI_FUNC(PyThreadState *) PyThreadState_GetUnchecked(void);
 
+// Alias kept for backward compatibility
+#define _PyThreadState_UncheckedGet PyThreadState_GetUnchecked
+
 
 // Disable tracing and profiling.
 PyAPI_FUNC(void) PyThreadState_EnterTracing(PyThreadState *tstate);

Misc/NEWS.d/next/C API/2023-11-15-18-36-21.gh-issue-112026._Yybr5.rst

@@ -0,0 +1,3 @@
+Add again the private ``_PyThreadState_UncheckedGet()`` function as an alias
+to the new public :c:func:`PyThreadState_GetUnchecked` function. Patch by
+Victor Stinner.