Fix _interpreters build.

Author: ZeroIntensity

Include/internal/pycore_interp_structs.h

@@ -979,11 +979,6 @@ struct _is {
         } trashcan;
     } runtime_immortals;
 
-    /* the initial PyInterpreterState.threads.head */
-    _PyThreadStateImpl _initial_thread;
-    // _initial_thread should be the last field of PyInterpreterState.
-    // See https://github.com/python/cpython/issues/127117.
-
 #if !defined(Py_GIL_DISABLED) && defined(Py_STACKREF_DEBUG)
     uint64_t next_stackref;
     _Py_hashtable_t *open_stackrefs_table;

Modules/_interpretersmodule.c

@@ -1,7 +1,6 @@
 /* interpreters module */
 /* low-level access to interpreter primitives */
 
-#include "object.h"
 #ifndef Py_BUILD_CORE_BUILTIN
 #  define Py_BUILD_CORE_MODULE 1
 #endif
@@ -196,7 +195,7 @@ static PyType_Slot XIBufferViewType_slots[] = {
 
 static PyType_Spec XIBufferViewType_spec = {
     .name = MODULE_NAME_STR ".CrossInterpreterBufferView",
-    .basicsize = sizeof(XIBufferViewObject),
+    .basicsize = sizeof(xibufferview),
     .flags = (_Py_TPFLAGS_CPYTHON | Py_TPFLAGS_BASETYPE |
               Py_TPFLAGS_DISALLOW_INSTANTIATION | Py_TPFLAGS_IMMUTABLETYPE),
     .slots = XIBufferViewType_slots,
@@ -1661,4 +1660,4 @@ PyMODINIT_FUNC
 MODINIT_FUNC_NAME(void)
 {
     return PyModuleDef_Init(&moduledef);
-}
+}