gh-127787: Move _PyUnicodeError_GetParams() to the internal C API (#128803)

Author: vstinner

Include/cpython/pyerrors.h

@@ -94,12 +94,6 @@ PyAPI_FUNC(void) _PyErr_ChainExceptions1(PyObject *);
 
 /* In exceptions.c */
 
-PyAPI_FUNC(int) _PyUnicodeError_GetParams(
-    PyObject *self,
-    PyObject **obj, Py_ssize_t *objlen,
-    Py_ssize_t *start, Py_ssize_t *end,
-    int as_bytes);
-
 PyAPI_FUNC(PyObject*) PyUnstable_Exc_PrepReraiseStar(
      PyObject *orig,
      PyObject *excs);

Include/internal/pycore_pyerrors.h

@@ -190,6 +190,15 @@ Py_DEPRECATED(3.12) extern void _PyErr_ChainExceptions(PyObject *, PyObject *, P
 PyAPI_DATA(PyTypeObject) _PyExc_IncompleteInputError;
 #define PyExc_IncompleteInputError ((PyObject *)(&_PyExc_IncompleteInputError))
 
+extern int _PyUnicodeError_GetParams(
+    PyObject *self,
+    PyObject **obj,
+    Py_ssize_t *objlen,
+    Py_ssize_t *start,
+    Py_ssize_t *end,
+    int as_bytes);
+
+
 #ifdef __cplusplus
 }
 #endif