Make PyAST_obj2mod C89 compliant. (Follow-up commit from asdl_c.py.)

Python/Python-ast.c

@@ -6749,10 +6749,18 @@ PyObject* PyAST_mod2obj(mod_ty t)
 mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode)
 {
     mod_ty res;
-    PyObject *req_type[] = {(PyObject*)Module_type, (PyObject*)Expression_type,
-                            (PyObject*)Interactive_type};
-    char *req_name[] = {"Module", "Expression", "Interactive"};
+    PyObject *req_type[3];
+    char *req_name[3];
     int isinstance;
+
+    req_type[0] = (PyObject*)Module_type;
+    req_type[1] = (PyObject*)Expression_type;
+    req_type[2] = (PyObject*)Interactive_type;
+
+    req_name[0] = "Module";
+    req_name[1] = "Expression";
+    req_name[2] = "Interactive";
+
     assert(0 <= mode && mode <= 2);
 
     init_types();