gh-144048: Use flexible array members

Not all cases can be converted because some structs with this are members in the middle of bigger structs, so changing them introduces warnings. Leave them alone for now.

Author: SiliconA-Z

Include/cpython/pystate.h

@@ -58,7 +58,7 @@ typedef struct _stack_chunk {
     struct _stack_chunk *previous;
     size_t size;
     size_t top;
-    PyObject * data[1]; /* Variable sized */
+    PyObject * data[];
 } _PyStackChunk;
 
 /* Minimum size of data stack chunk */

Modules/_sre/sre.h

@@ -65,7 +65,7 @@ typedef struct {
     struct {
         Py_ssize_t index;
         PyObject *literal;  /* NULL if empty */
-    } items[0];
+    } items[];
 } TemplateObject;
 
 typedef struct SRE_REPEAT_T {

Objects/memoryobject.c

@@ -1042,7 +1042,7 @@ memoryview__from_flags_impl(PyTypeObject *type, PyObject *object, int flags)
 
 typedef struct {
     Py_buffer view;
-    Py_ssize_t array[1];
+    Py_ssize_t array[];
 } Py_buffer_full;
 
 int