bpo-36297: remove "unicode_internal" codec (GH-12342)

diff --git a/Modules/clinic/_codecsmodule.c.h b/Modules/clinic/_codecsmodule.c.h
index d1f4cf3..65e2483 100644
--- a/Modules/clinic/_codecsmodule.c.h
+++ b/Modules/clinic/_codecsmodule.c.h
@@ -370,57 +370,6 @@
     return return_value;
 }
 
-PyDoc_STRVAR(_codecs_unicode_internal_decode__doc__,
-"unicode_internal_decode($module, obj, errors=None, /)\n"
-"--\n"
-"\n");
-
-#define _CODECS_UNICODE_INTERNAL_DECODE_METHODDEF    \
-    {"unicode_internal_decode", (PyCFunction)(void(*)(void))_codecs_unicode_internal_decode, METH_FASTCALL, _codecs_unicode_internal_decode__doc__},
-
-static PyObject *
-_codecs_unicode_internal_decode_impl(PyObject *module, PyObject *obj,
-                                     const char *errors);
-
-static PyObject *
-_codecs_unicode_internal_decode(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
-{
-    PyObject *return_value = NULL;
-    PyObject *obj;
-    const char *errors = NULL;
-
-    if (!_PyArg_CheckPositional("unicode_internal_decode", nargs, 1, 2)) {
-        goto exit;
-    }
-    obj = args[0];
-    if (nargs < 2) {
-        goto skip_optional;
-    }
-    if (args[1] == Py_None) {
-        errors = NULL;
-    }
-    else if (PyUnicode_Check(args[1])) {
-        Py_ssize_t errors_length;
-        errors = PyUnicode_AsUTF8AndSize(args[1], &errors_length);
-        if (errors == NULL) {
-            goto exit;
-        }
-        if (strlen(errors) != (size_t)errors_length) {
-            PyErr_SetString(PyExc_ValueError, "embedded null character");
-            goto exit;
-        }
-    }
-    else {
-        _PyArg_BadArgument("unicode_internal_decode", 2, "str or None", args[1]);
-        goto exit;
-    }
-skip_optional:
-    return_value = _codecs_unicode_internal_decode_impl(module, obj, errors);
-
-exit:
-    return return_value;
-}
-
 PyDoc_STRVAR(_codecs_utf_7_decode__doc__,
 "utf_7_decode($module, data, errors=None, final=False, /)\n"
 "--\n"
@@ -1853,57 +1802,6 @@
     return return_value;
 }
 
-PyDoc_STRVAR(_codecs_unicode_internal_encode__doc__,
-"unicode_internal_encode($module, obj, errors=None, /)\n"
-"--\n"
-"\n");
-
-#define _CODECS_UNICODE_INTERNAL_ENCODE_METHODDEF    \
-    {"unicode_internal_encode", (PyCFunction)(void(*)(void))_codecs_unicode_internal_encode, METH_FASTCALL, _codecs_unicode_internal_encode__doc__},
-
-static PyObject *
-_codecs_unicode_internal_encode_impl(PyObject *module, PyObject *obj,
-                                     const char *errors);
-
-static PyObject *
-_codecs_unicode_internal_encode(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
-{
-    PyObject *return_value = NULL;
-    PyObject *obj;
-    const char *errors = NULL;
-
-    if (!_PyArg_CheckPositional("unicode_internal_encode", nargs, 1, 2)) {
-        goto exit;
-    }
-    obj = args[0];
-    if (nargs < 2) {
-        goto skip_optional;
-    }
-    if (args[1] == Py_None) {
-        errors = NULL;
-    }
-    else if (PyUnicode_Check(args[1])) {
-        Py_ssize_t errors_length;
-        errors = PyUnicode_AsUTF8AndSize(args[1], &errors_length);
-        if (errors == NULL) {
-            goto exit;
-        }
-        if (strlen(errors) != (size_t)errors_length) {
-            PyErr_SetString(PyExc_ValueError, "embedded null character");
-            goto exit;
-        }
-    }
-    else {
-        _PyArg_BadArgument("unicode_internal_encode", 2, "str or None", args[1]);
-        goto exit;
-    }
-skip_optional:
-    return_value = _codecs_unicode_internal_encode_impl(module, obj, errors);
-
-exit:
-    return return_value;
-}
-
 PyDoc_STRVAR(_codecs_utf_7_encode__doc__,
 "utf_7_encode($module, str, errors=None, /)\n"
 "--\n"
@@ -3024,4 +2922,4 @@
 #ifndef _CODECS_CODE_PAGE_ENCODE_METHODDEF
     #define _CODECS_CODE_PAGE_ENCODE_METHODDEF
 #endif /* !defined(_CODECS_CODE_PAGE_ENCODE_METHODDEF) */
-/*[clinic end generated code: output=02bd0f0cf9a28150 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=da3c47709a55a05e input=a9049054013a1b77]*/