Issue #28858: Remove _PyObject_CallArg1() macro

Replace
   _PyObject_CallArg1(func, arg)
with
   PyObject_CallFunctionObjArgs(func, arg, NULL)

Using the _PyObject_CallArg1() macro increases the usage of the C stack, which
was unexpected and unwanted. PyObject_CallFunctionObjArgs() doesn't have this
issue.

Python/_warnings.c

@@ -476,7 +476,7 @@ warn_explicit(PyObject *category, PyObject *message,
     }
     else {
         text = message;
-        message = _PyObject_CallArg1(category, message);
+        message = PyObject_CallFunctionObjArgs(category, message, NULL);
         if (message == NULL)
             goto cleanup;
     }

Python/codecs.c

@@ -322,7 +322,7 @@ PyObject *codec_getstreamcodec(const char *encoding,
     if (errors != NULL)
         streamcodec = PyObject_CallFunction(codeccls, "Os", stream, errors);
     else
-        streamcodec = _PyObject_CallArg1(codeccls, stream);
+        streamcodec = PyObject_CallFunctionObjArgs(codeccls, stream, NULL);
     Py_DECREF(codecs);
     return streamcodec;
 }

Python/errors.c

@@ -62,7 +62,7 @@ _PyErr_CreateException(PyObject *exception, PyObject *value)
         return PyObject_Call(exception, value, NULL);
     }
     else {
-        return _PyObject_CallArg1(exception, value);
+        return PyObject_CallFunctionObjArgs(exception, value, NULL);
     }
 }
 

Python/sysmodule.c

@@ -2325,7 +2325,7 @@ sys_pyfile_write_unicode(PyObject *unicode, PyObject *file)
     if (writer == NULL)
         goto error;
 
-    result = _PyObject_CallArg1(writer, unicode);
+    result = PyObject_CallFunctionObjArgs(writer, unicode, NULL);
     if (result == NULL) {
         goto error;
     } else {