gpg: Allow decryption using PIV cards.
* g10/call-agent.c (struct getattr_one_parm_s): New. (getattr_one_status_cb): New. (agent_scd_getattr_one): New. * g10/pubkey-enc.c (get_it): Allow the standard leading zero byte from pkcs#1. * g10/skclist.c (enum_secret_keys): Handle non-OpenPGP cards.
- Signed-off-by: Werner Koch <wk@gnupg.org>