bpo-37253: Remove PyAST_obj2mod_ex() function (GH-14020)

PyAST_obj2mod_ex() is similar to PyAST_obj2mod() with an additional
'feature_version' parameter which is unused.

Include/Python-ast.h

@@ -707,7 +707,6 @@ type_ignore_ty _Py_TypeIgnore(int lineno, string tag, PyArena *arena);
 
 PyObject* PyAST_mod2obj(mod_ty t);
 mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode);
-mod_ty PyAST_obj2mod_ex(PyObject* ast, PyArena* arena, int mode, int feature_version);
 int PyAST_Check(PyObject* obj);
 
 #ifdef __cplusplus

Parser/asdl_c.py

@@ -1190,11 +1190,6 @@ PyObject* PyAST_mod2obj(mod_ty t)
 
 /* mode is 0 for "exec", 1 for "eval" and 2 for "single" input */
 mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode)
-{
-    return PyAST_obj2mod_ex(ast, arena, mode, PY_MINOR_VERSION);
-}
-
-mod_ty PyAST_obj2mod_ex(PyObject* ast, PyArena* arena, int mode, int feature_version)
 {
     mod_ty res;
     PyObject *req_type[3];
@@ -1280,7 +1275,6 @@ def main(srcfile, dump_module=False):
             f.write("\n")
             f.write("PyObject* PyAST_mod2obj(mod_ty t);\n")
             f.write("mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode);\n")
-            f.write("mod_ty PyAST_obj2mod_ex(PyObject* ast, PyArena* arena, int mode, int feature_version);\n")
             f.write("int PyAST_Check(PyObject* obj);\n")
             f.write('\n')
             f.write('#ifdef __cplusplus\n')

Python/Python-ast.c

@@ -8990,11 +8990,6 @@ PyObject* PyAST_mod2obj(mod_ty t)
 
 /* mode is 0 for "exec", 1 for "eval" and 2 for "single" input */
 mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode)
-{
-    return PyAST_obj2mod_ex(ast, arena, mode, PY_MINOR_VERSION);
-}
-
-mod_ty PyAST_obj2mod_ex(PyObject* ast, PyArena* arena, int mode, int feature_version)
 {
     mod_ty res;
     PyObject *req_type[3];