scd: One new and one improved 7816 function.
* scd/apdu.c (apdu_send_direct): New arg R_SW. * scd/command.c (cmd_apdu): Ditto. * scd/iso7816.c (iso7816_apdu_direct): New arg R_SW. (iso7816_general_authenticate): New. * scd/app-nks.c (get_chv_status, get_nks_version): Pass NULL for new arg.
iso7816_general_authenticate will be used for the PIV card support.
The new arg to iso7816_apdu_direct and apdu_send_direct allows to get
the raw status word back without the need to handle an output buffer.
(cherry picked from commit 70bb5c7931598590b1acfae90bf4657f5911d2d3)
- Signed-off-by: Werner Koch <wk@gnupg.org>