gpg: Ed448 and X448 are only for v5 (for subkey).
* g10/keygen.c (generate_subkeypair): Specify KEYGEN_FLAG_CREATE_V5_KEY for Ed448 or X448 key.
- Reported-by: William Holmes
- Fixes-commit: 36355394d865f5760075e62267d70f7a7d5dd671
- GnuPG-bug-id: T5609
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>